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glibc  2.9
Defines | Functions | Variables
wordexp.c File Reference
#include <alloca.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <glob.h>
#include <libintl.h>
#include <paths.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <wordexp.h>
#include <kernel-features.h>
#include <bits/libc-lock.h>
#include <stdio-common/_itoa.h>
#include <assert.h>
#include <device-nrs.h>
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Defines

#define W_CHUNK   (100)
#define bufsize   128

Functions

static int parse_dollars (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, int flags, wordexp_t *pwordexp, const char *ifs, const char *ifs_white, int quoted) internal_function
static int parse_backtick (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, int flags, wordexp_t *pwordexp, const char *ifs, const char *ifs_white) internal_function
static int parse_dquote (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, int flags, wordexp_t *pwordexp, const char *ifs, const char *ifs_white) internal_function
static int eval_expr (char *expr, long int *result) internal_function
static char * w_newword (size_t *actlen, size_t *maxlen)
static char * w_addchar (char *buffer, size_t *actlen, size_t *maxlen, char ch)
static char *internal_function w_addmem (char *buffer, size_t *actlen, size_t *maxlen, const char *str, size_t len)
static char *internal_function w_addstr (char *buffer, size_t *actlen, size_t *maxlen, const char *str)
static int internal_function w_addword (wordexp_t *pwordexp, char *word)
static int internal_function parse_backslash (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset)
static int internal_function parse_qtd_backslash (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset)
static int internal_function parse_tilde (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, size_t wordc)
static int internal_function do_parse_glob (const char *glob_word, char **word, size_t *word_length, size_t *max_length, wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
static int internal_function parse_glob (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, int flags, wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
static int internal_function parse_squote (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset)
static int internal_function eval_expr_val (char **expr, long int *result)
static int internal_function eval_expr_multdiv (char **expr, long int *result)
static int internal_function parse_arith (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, int flags, int bracket)
static void internal_function __attribute__ ((always_inline))
static int internal_function exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length, int flags, wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
static int internal_function parse_comm (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, int flags, wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
static int internal_function parse_param (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, int flags, wordexp_t *pwordexp, const char *ifs, const char *ifs_white, int quoted)
void wordfree (wordexp_t *pwordexp)
 libc_hidden_def (wordfree)

Variables

int __libc_argc attribute_hidden

Define Documentation

#define bufsize   128
#define W_CHUNK   (100)

Definition at line 85 of file wordexp.c.


Function Documentation

static void internal_function __attribute__ ( (always_inline)  ) [inline, static]

Definition at line 818 of file wordexp.c.

{
  const char *args[4] = { _PATH_BSHELL, "-c", comm, NULL };

  /* Execute the command, or just check syntax? */
  if (noexec)
    args[1] = "-nc";

  /* Redirect output.  */
  if (__builtin_expect (fildes[1] != STDOUT_FILENO, 1))
    {
      __dup2 (fildes[1], STDOUT_FILENO);
      __close (fildes[1]);
    }
  else
    {
#ifdef O_CLOEXEC
      /* Reset the close-on-exec flag (if necessary).  */
# ifndef __ASSUME_PIPE2
      if (__have_pipe2 > 0)
# endif
       __fcntl (fildes[1], F_SETFD, 0);
#endif
    }

  /* Redirect stderr to /dev/null if we have to.  */
  if (showerr == 0)
    {
      struct stat64 st;
      int fd;
      __close (STDERR_FILENO);
      fd = __open (_PATH_DEVNULL, O_WRONLY);
      if (fd >= 0 && fd != STDERR_FILENO)
       {
         __dup2 (fd, STDERR_FILENO);
         __close (fd);
       }
      /* Be paranoid.  Check that we actually opened the /dev/null
         device.  */
      if (__builtin_expect (__fxstat64 (_STAT_VER, STDERR_FILENO, &st), 0) != 0
         || __builtin_expect (S_ISCHR (st.st_mode), 1) == 0
#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR
         || st.st_rdev != makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR)
#endif
         )
       /* It's not the /dev/null device.  Stop right here.  The
           problem is: how do we stop?  We use _exit() with an
           hopefully unusual exit code.  */
       _exit (90);
    }

  /* Make sure the subshell doesn't field-split on our behalf. */
  __unsetenv ("IFS");

  __close (fildes[0]);
  __execve (_PATH_BSHELL, (char *const *) args, __environ);

  /* Bad.  What now?  */
  abort ();
}

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static int internal_function do_parse_glob ( const char *  glob_word,
char **  word,
size_t word_length,
size_t max_length,
wordexp_t pwordexp,
const char *  ifs,
const char *  ifs_white 
) [static]

Definition at line 385 of file wordexp.c.

{
  int error;
  unsigned int match;
  glob_t globbuf;

  error = glob (glob_word, GLOB_NOCHECK, NULL, &globbuf);

  if (error != 0)
    {
      /* We can only run into memory problems.  */
      assert (error == GLOB_NOSPACE);
      return WRDE_NOSPACE;
    }

  if (ifs && !*ifs)
    {
      /* No field splitting allowed. */
      assert (globbuf.gl_pathv[0] != NULL);
      *word = w_addstr (*word, word_length, max_length, globbuf.gl_pathv[0]);
      for (match = 1; match < globbuf.gl_pathc && *word != NULL; ++match)
       {
         *word = w_addchar (*word, word_length, max_length, ' ');
         if (*word != NULL)
           *word = w_addstr (*word, word_length, max_length,
                           globbuf.gl_pathv[match]);
       }

      globfree (&globbuf);
      return *word ? 0 : WRDE_NOSPACE;
    }

  assert (ifs == NULL || *ifs != '\0');
  if (*word != NULL)
    {
      free (*word);
      *word = w_newword (word_length, max_length);
    }

  for (match = 0; match < globbuf.gl_pathc; ++match)
    {
      char *matching_word = __strdup (globbuf.gl_pathv[match]);
      if (matching_word == NULL || w_addword (pwordexp, matching_word))
       {
         globfree (&globbuf);
         return WRDE_NOSPACE;
       }
    }

  globfree (&globbuf);
  return 0;
}

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static int internal_function eval_expr ( char *  expr,
long int result 
) [static]

Definition at line 632 of file wordexp.c.

{
  long int arg;

  /* Read a Multdiv */
  if (eval_expr_multdiv (&expr, result) != 0)
    return WRDE_SYNTAX;

  while (*expr)
    {
      /* Skip white space */
      for (; expr && *expr && isspace (*expr); ++expr);

      if (*expr == '+')
       {
         ++expr;
         if (eval_expr_multdiv (&expr, &arg) != 0)
           return WRDE_SYNTAX;

         *result += arg;
       }
      else if (*expr == '-')
       {
         ++expr;
         if (eval_expr_multdiv (&expr, &arg) != 0)
           return WRDE_SYNTAX;

         *result -= arg;
       }
      else break;
    }

  return 0;
}

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static int internal_function eval_expr_multdiv ( char **  expr,
long int result 
) [static]

Definition at line 595 of file wordexp.c.

{
  long int arg;

  /* Read a Value */
  if (eval_expr_val (expr, result) != 0)
    return WRDE_SYNTAX;

  while (**expr)
    {
      /* Skip white space */
      for (; *expr && **expr && isspace (**expr); ++(*expr));

      if (**expr == '*')
       {
         ++(*expr);
         if (eval_expr_val (expr, &arg) != 0)
           return WRDE_SYNTAX;

         *result *= arg;
       }
      else if (**expr == '/')
       {
         ++(*expr);
         if (eval_expr_val (expr, &arg) != 0)
           return WRDE_SYNTAX;

         *result /= arg;
       }
      else break;
    }

  return 0;
}

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static int internal_function eval_expr_val ( char **  expr,
long int result 
) [static]

Definition at line 560 of file wordexp.c.

{
  char *digit;

  /* Skip white space */
  for (digit = *expr; digit && *digit && isspace (*digit); ++digit);

  if (*digit == '(')
    {
      /* Scan for closing paren */
      for (++digit; **expr && **expr != ')'; ++(*expr));

      /* Is there one? */
      if (!**expr)
       return WRDE_SYNTAX;

      *(*expr)++ = 0;

      if (eval_expr (digit, result))
       return WRDE_SYNTAX;

      return 0;
    }

  /* POSIX requires that decimal, octal, and hexadecimal constants are
     recognized.  Therefore we pass 0 as the third parameter to strtol.  */
  *result = strtol (digit, expr, 0);
  if (digit == *expr)
    return WRDE_SYNTAX;

  return 0;
}

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static int internal_function exec_comm ( char *  comm,
char **  word,
size_t word_length,
size_t max_length,
int  flags,
wordexp_t pwordexp,
const char *  ifs,
const char *  ifs_white 
) [static]

Definition at line 884 of file wordexp.c.

{
  int fildes[2];
#define bufsize 128
  int buflen;
  int i;
  int status = 0;
  size_t maxnewlines = 0;
  char buffer[bufsize];
  pid_t pid;
  int noexec = 0;

  /* Don't fork() unless necessary */
  if (!comm || !*comm)
    return 0;

#ifdef O_CLOEXEC
# ifndef __ASSUME_PIPE2
  if (__have_pipe2 >= 0)
# endif
    {
      int r = __pipe2 (fildes, O_CLOEXEC);
# ifndef __ASSUME_PIPE2
      if (__have_pipe2 == 0)
       __have_pipe2 = r != -1 || errno != ENOSYS ? 1 : -1;

      if (__have_pipe2 > 0)
# endif
       if (r < 0)
         /* Bad */
         return WRDE_NOSPACE;
    }
#endif
#ifndef __ASSUME_PIPE2
# ifdef O_CLOEXEC
  if (__have_pipe2 < 0)
# endif
    if (__pipe (fildes) < 0)
      /* Bad */
      return WRDE_NOSPACE;
#endif

 again:
  if ((pid = __fork ()) < 0)
    {
      /* Bad */
      __close (fildes[0]);
      __close (fildes[1]);
      return WRDE_NOSPACE;
    }

  if (pid == 0)
    exec_comm_child (comm, fildes, noexec ? 0 : flags & WRDE_SHOWERR, noexec);

  /* Parent */

  /* If we are just testing the syntax, only wait.  */
  if (noexec)
    return (TEMP_FAILURE_RETRY (__waitpid (pid, &status, 0)) == pid
           && status != 0) ? WRDE_SYNTAX : 0;

  __close (fildes[1]);
  fildes[1] = -1;

  if (!pwordexp)
    /* Quoted - no field splitting */
    {
      while (1)
       {
         if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
                                              bufsize))) < 1)
           {
             if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, WNOHANG)) == 0)
              continue;
             if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
                                                 bufsize))) < 1)
              break;
           }

         maxnewlines += buflen;

         *word = w_addmem (*word, word_length, max_length, buffer, buflen);
         if (*word == NULL)
           goto no_space;
       }
    }
  else
    /* Not quoted - split fields */
    {
      int copying = 0;
      /* 'copying' is:
       *  0 when searching for first character in a field not IFS white space
       *  1 when copying the text of a field
       *  2 when searching for possible non-whitespace IFS
       *  3 when searching for non-newline after copying field
       */

      while (1)
       {
         if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
                                              bufsize))) < 1)
           {
             if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, WNOHANG)) == 0)
              continue;
             if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
                                                 bufsize))) < 1)
              break;
           }

         for (i = 0; i < buflen; ++i)
           {
             if (strchr (ifs, buffer[i]) != NULL)
              {
                /* Current character is IFS */
                if (strchr (ifs_white, buffer[i]) == NULL)
                  {
                    /* Current character is IFS but not whitespace */
                    if (copying == 2)
                     {
                       /*            current character
                        *                   |
                        *                   V
                        * eg: text<space><comma><space>moretext
                        *
                        * So, strip whitespace IFS (like at the start)
                        */
                       copying = 0;
                       continue;
                     }

                    copying = 0;
                    /* fall through and delimit field.. */
                  }
                else
                  {
                    if (buffer[i] == '\n')
                     {
                       /* Current character is (IFS) newline */

                       /* If copying a field, this is the end of it,
                          but maybe all that's left is trailing newlines.
                          So start searching for a non-newline. */
                       if (copying == 1)
                         copying = 3;

                       continue;
                     }
                    else
                     {
                       /* Current character is IFS white space, but
                          not a newline */

                       /* If not either copying a field or searching
                          for non-newline after a field, ignore it */
                       if (copying != 1 && copying != 3)
                         continue;

                       /* End of field (search for non-ws IFS afterwards) */
                       copying = 2;
                     }
                  }

                /* First IFS white space (non-newline), or IFS non-whitespace.
                 * Delimit the field.  Nulls are converted by w_addword. */
                if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
                  goto no_space;

                *word = w_newword (word_length, max_length);

                maxnewlines = 0;
                /* fall back round the loop.. */
              }
             else
              {
                /* Not IFS character */

                if (copying == 3)
                  {
                    /* Nothing but (IFS) newlines since the last field,
                       so delimit it here before starting new word */
                    if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
                     goto no_space;

                    *word = w_newword (word_length, max_length);
                  }

                copying = 1;

                if (buffer[i] == '\n') /* happens if newline not in IFS */
                  maxnewlines++;
                else
                  maxnewlines = 0;

                *word = w_addchar (*word, word_length, max_length,
                                 buffer[i]);
                if (*word == NULL)
                  goto no_space;
              }
           }
       }
    }

  /* Chop off trailing newlines (required by POSIX.2)  */
  /* Ensure we don't go back further than the beginning of the
     substitution (i.e. remove maxnewlines bytes at most) */
  while (maxnewlines-- != 0 &&
         *word_length > 0 && (*word)[*word_length - 1] == '\n')
    {
      (*word)[--*word_length] = '\0';

      /* If the last word was entirely newlines, turn it into a new word
       * which can be ignored if there's nothing following it. */
      if (*word_length == 0)
       {
         free (*word);
         *word = w_newword (word_length, max_length);
         break;
       }
    }

  __close (fildes[0]);
  fildes[0] = -1;

  /* Check for syntax error (re-execute but with "-n" flag) */
  if (buflen < 1 && status != 0)
    {
      noexec = 1;
      goto again;
    }

  return 0;

no_space:
  __kill (pid, SIGKILL);
  TEMP_FAILURE_RETRY (__waitpid (pid, NULL, 0));
  __close (fildes[0]);
  return WRDE_NOSPACE;
}

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Definition at line 2245 of file wordexp.c.

{
  size_t words_offset;
  size_t word_length;
  size_t max_length;
  char *word = w_newword (&word_length, &max_length);
  int error;
  char *ifs;
  char ifs_white[4];
  wordexp_t old_word = *pwordexp;

  if (flags & WRDE_REUSE)
    {
      /* Minimal implementation of WRDE_REUSE for now */
      wordfree (pwordexp);
      old_word.we_wordv = NULL;
    }

  if ((flags & WRDE_APPEND) == 0)
    {
      pwordexp->we_wordc = 0;

      if (flags & WRDE_DOOFFS)
       {
         pwordexp->we_wordv = calloc (1 + pwordexp->we_offs, sizeof (char *));
         if (pwordexp->we_wordv == NULL)
           {
             error = WRDE_NOSPACE;
             goto do_error;
           }
       }
      else
       {
         pwordexp->we_wordv = calloc (1, sizeof (char *));
         if (pwordexp->we_wordv == NULL)
           {
             error = WRDE_NOSPACE;
             goto do_error;
           }

         pwordexp->we_offs = 0;
       }
    }

  /* Find out what the field separators are.
   * There are two types: whitespace and non-whitespace.
   */
  ifs = getenv ("IFS");

  if (ifs == NULL)
    /* IFS unset - use <space><tab><newline>. */
    ifs = strcpy (ifs_white, " \t\n");
  else
    {
      char *ifsch = ifs;
      char *whch = ifs_white;

      while (*ifsch != '\0')
       {
         if (*ifsch == ' ' || *ifsch == '\t' || *ifsch == '\n')
           {
             /* Whitespace IFS.  See first whether it is already in our
               collection.  */
             char *runp = ifs_white;

             while (runp < whch && *runp != *ifsch)
              ++runp;

             if (runp == whch)
              *whch++ = *ifsch;
           }

         ++ifsch;
       }
      *whch = '\0';
    }

  for (words_offset = 0 ; words[words_offset] ; ++words_offset)
    switch (words[words_offset])
      {
      case '\\':
       error = parse_backslash (&word, &word_length, &max_length, words,
                             &words_offset);

       if (error)
         goto do_error;

       break;

      case '$':
       error = parse_dollars (&word, &word_length, &max_length, words,
                            &words_offset, flags, pwordexp, ifs, ifs_white,
                            0);

       if (error)
         goto do_error;

       break;

      case '`':
       if (flags & WRDE_NOCMD)
         {
           error = WRDE_CMDSUB;
           goto do_error;
         }

       ++words_offset;
       error = parse_backtick (&word, &word_length, &max_length, words,
                            &words_offset, flags, pwordexp, ifs,
                            ifs_white);

       if (error)
         goto do_error;

       break;

      case '"':
       ++words_offset;
       error = parse_dquote (&word, &word_length, &max_length, words,
                           &words_offset, flags, pwordexp, ifs, ifs_white);

       if (error)
         goto do_error;

       if (!word_length)
         {
           error = w_addword (pwordexp, NULL);

           if (error)
             return error;
         }

       break;

      case '\'':
       ++words_offset;
       error = parse_squote (&word, &word_length, &max_length, words,
                           &words_offset);

       if (error)
         goto do_error;

       if (!word_length)
         {
           error = w_addword (pwordexp, NULL);

           if (error)
             return error;
         }

       break;

      case '~':
       error = parse_tilde (&word, &word_length, &max_length, words,
                          &words_offset, pwordexp->we_wordc);

       if (error)
         goto do_error;

       break;

      case '*':
      case '[':
      case '?':
       error = parse_glob (&word, &word_length, &max_length, words,
                         &words_offset, flags, pwordexp, ifs, ifs_white);

       if (error)
         goto do_error;

       break;

      default:
       /* Is it a word separator? */
       if (strchr (" \t", words[words_offset]) == NULL)
         {
           char ch = words[words_offset];

           /* Not a word separator -- but is it a valid word char? */
           if (strchr ("\n|&;<>(){}", ch))
             {
              /* Fail */
              error = WRDE_BADCHAR;
              goto do_error;
             }

           /* "Ordinary" character -- add it to word */
           word = w_addchar (word, &word_length, &max_length,
                           ch);
           if (word == NULL)
             {
              error = WRDE_NOSPACE;
              goto do_error;
             }

           break;
         }

       /* If a word has been delimited, add it to the list. */
       if (word != NULL)
         {
           error = w_addword (pwordexp, word);
           if (error)
             goto do_error;
         }

       word = w_newword (&word_length, &max_length);
      }

  /* End of string */

  /* There was a word separator at the end */
  if (word == NULL) /* i.e. w_newword */
    return 0;

  /* There was no field separator at the end */
  return w_addword (pwordexp, word);

do_error:
  /* Error:
   *   free memory used (unless error is WRDE_NOSPACE), and
   *   set pwordexp members back to what they were.
   */

  free (word);

  if (error == WRDE_NOSPACE)
    return WRDE_NOSPACE;

  if ((flags & WRDE_APPEND) == 0)
    wordfree (pwordexp);

  *pwordexp = old_word;
  return error;
}

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static int internal_function parse_arith ( char **  word,
size_t word_length,
size_t max_length,
const char *  words,
size_t offset,
int  flags,
int  bracket 
) [static]

Definition at line 669 of file wordexp.c.

{
  /* We are poised just after "$((" or "$[" */
  int error;
  int paren_depth = 1;
  size_t expr_length;
  size_t expr_maxlen;
  char *expr;

  expr = w_newword (&expr_length, &expr_maxlen);
  for (; words[*offset]; ++(*offset))
    {
      switch (words[*offset])
       {
       case '$':
         error = parse_dollars (&expr, &expr_length, &expr_maxlen,
                             words, offset, flags, NULL, NULL, NULL, 1);
         /* The ``1'' here is to tell parse_dollars not to
          * split the fields.
          */
         if (error)
           {
             free (expr);
             return error;
           }
         break;

       case '`':
         (*offset)++;
         error = parse_backtick (&expr, &expr_length, &expr_maxlen,
                              words, offset, flags, NULL, NULL, NULL);
         /* The first NULL here is to tell parse_backtick not to
          * split the fields.
          */
         if (error)
           {
             free (expr);
             return error;
           }
         break;

       case '\\':
         error = parse_qtd_backslash (&expr, &expr_length, &expr_maxlen,
                                   words, offset);
         if (error)
           {
             free (expr);
             return error;
           }
         /* I think that a backslash within an
          * arithmetic expansion is bound to
          * cause an error sooner or later anyway though.
          */
         break;

       case ')':
         if (--paren_depth == 0)
           {
             char result[21];      /* 21 = ceil(log10(2^64)) + 1 */
             long int numresult = 0;
             long long int convertme;

             if (bracket || words[1 + *offset] != ')')
              {
                free (expr);
                return WRDE_SYNTAX;
              }

             ++(*offset);

             /* Go - evaluate. */
             if (*expr && eval_expr (expr, &numresult) != 0)
              {
                free (expr);
                return WRDE_SYNTAX;
              }

             if (numresult < 0)
              {
                convertme = -numresult;
                *word = w_addchar (*word, word_length, max_length, '-');
                if (!*word)
                  {
                    free (expr);
                    return WRDE_NOSPACE;
                  }
              }
             else
              convertme = numresult;

             result[20] = '\0';
             *word = w_addstr (*word, word_length, max_length,
                            _itoa (convertme, &result[20], 10, 0));
             free (expr);
             return *word ? 0 : WRDE_NOSPACE;
           }
         expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
         if (expr == NULL)
           return WRDE_NOSPACE;

         break;

       case ']':
         if (bracket && paren_depth == 1)
           {
             char result[21];      /* 21 = ceil(log10(2^64)) + 1 */
             long int numresult = 0;

             /* Go - evaluate. */
             if (*expr && eval_expr (expr, &numresult) != 0)
              {
                free (expr);
                return WRDE_SYNTAX;
              }

             result[20] = '\0';
             *word = w_addstr (*word, word_length, max_length,
                            _itoa_word (numresult, &result[20], 10, 0));
             free (expr);
             return *word ? 0 : WRDE_NOSPACE;
           }

         free (expr);
         return WRDE_SYNTAX;

       case '\n':
       case ';':
       case '{':
       case '}':
         free (expr);
         return WRDE_BADCHAR;

       case '(':
         ++paren_depth;
       default:
         expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
         if (expr == NULL)
           return WRDE_NOSPACE;
       }
    }

  /* Premature end */
  free (expr);
  return WRDE_SYNTAX;
}

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static int internal_function parse_backslash ( char **  word,
size_t word_length,
size_t max_length,
const char *  words,
size_t offset 
) [static]

Definition at line 206 of file wordexp.c.

{
  /* We are poised _at_ a backslash, not in quotes */

  switch (words[1 + *offset])
    {
    case 0:
      /* Backslash is last character of input words */
      return WRDE_SYNTAX;

    case '\n':
      ++(*offset);
      break;

    default:
      *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
      if (*word == NULL)
       return WRDE_NOSPACE;

      ++(*offset);
      break;
    }

  return 0;
}

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static int internal_function parse_backtick ( char **  word,
size_t word_length,
size_t max_length,
const char *  words,
size_t offset,
int  flags,
wordexp_t pwordexp,
const char *  ifs,
const char *  ifs_white 
) [static]

Definition at line 2100 of file wordexp.c.

{
  /* We are poised just after "`" */
  int error;
  int squoting = 0;
  size_t comm_length;
  size_t comm_maxlen;
  char *comm = w_newword (&comm_length, &comm_maxlen);

  for (; words[*offset]; ++(*offset))
    {
      switch (words[*offset])
       {
       case '`':
         /* Go -- give the script to the shell */
         error = exec_comm (comm, word, word_length, max_length, flags,
                          pwordexp, ifs, ifs_white);
         free (comm);
         return error;

       case '\\':
         if (squoting)
           {
             error = parse_qtd_backslash (&comm, &comm_length, &comm_maxlen,
                                      words, offset);

             if (error)
              {
                free (comm);
                return error;
              }

             break;
           }

         ++(*offset);
         error = parse_backslash (&comm, &comm_length, &comm_maxlen, words,
                               offset);

         if (error)
           {
             free (comm);
             return error;
           }

         break;

       case '\'':
         squoting = 1 - squoting;
       default:
         comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
         if (comm == NULL)
           return WRDE_NOSPACE;
       }
    }

  /* Premature end */
  free (comm);
  return WRDE_SYNTAX;
}

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static int internal_function parse_comm ( char **  word,
size_t word_length,
size_t max_length,
const char *  words,
size_t offset,
int  flags,
wordexp_t pwordexp,
const char *  ifs,
const char *  ifs_white 
) [static]

Definition at line 1127 of file wordexp.c.

{
  /* We are poised just after "$(" */
  int paren_depth = 1;
  int error = 0;
  int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
  size_t comm_length;
  size_t comm_maxlen;
  char *comm = w_newword (&comm_length, &comm_maxlen);

  for (; words[*offset]; ++(*offset))
    {
      switch (words[*offset])
       {
       case '\'':
         if (quoted == 0)
           quoted = 1;
         else if (quoted == 1)
           quoted = 0;

         break;

       case '"':
         if (quoted == 0)
           quoted = 2;
         else if (quoted == 2)
           quoted = 0;

         break;

       case ')':
         if (!quoted && --paren_depth == 0)
           {
             /* Go -- give script to the shell */
             if (comm)
              {
#ifdef __libc_ptf_call
                /* We do not want the exec_comm call to be cut short
                   by a thread cancellation since cleanup is very
                   ugly.  Therefore disable cancellation for
                   now.  */
                // XXX Ideally we do want the thread being cancelable.
                // XXX If demand is there we'll change it.
                int state = PTHREAD_CANCEL_ENABLE;
                __libc_ptf_call (pthread_setcancelstate,
                               (PTHREAD_CANCEL_DISABLE, &state), 0);
#endif

                error = exec_comm (comm, word, word_length, max_length,
                                 flags, pwordexp, ifs, ifs_white);

#ifdef __libc_ptf_call
                __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
#endif

                free (comm);
              }

             return error;
           }

         /* This is just part of the script */
         break;

       case '(':
         if (!quoted)
           ++paren_depth;
       }

      comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
      if (comm == NULL)
       return WRDE_NOSPACE;
    }

  /* Premature end.  */
  free (comm);

  return WRDE_SYNTAX;
}

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static int internal_function parse_dollars ( char **  word,
size_t word_length,
size_t max_length,
const char *  words,
size_t offset,
int  flags,
wordexp_t pwordexp,
const char *  ifs,
const char *  ifs_white,
int  quoted 
) [static]

Definition at line 2038 of file wordexp.c.

{
  /* We are poised _at_ "$" */
  switch (words[1 + *offset])
    {
    case '"':
    case '\'':
    case 0:
      *word = w_addchar (*word, word_length, max_length, '$');
      return *word ? 0 : WRDE_NOSPACE;

    case '(':
      if (words[2 + *offset] == '(')
       {
         /* Differentiate between $((1+3)) and $((echo);(ls)) */
         int i = 3 + *offset;
         int depth = 0;
         while (words[i] && !(depth == 0 && words[i] == ')'))
           {
             if (words[i] == '(')
              ++depth;
             else if (words[i] == ')')
              --depth;

             ++i;
           }

         if (words[i] == ')' && words[i + 1] == ')')
           {
             (*offset) += 3;
             /* Call parse_arith -- 0 is for "no brackets" */
             return parse_arith (word, word_length, max_length, words, offset,
                              flags, 0);
           }
       }

      if (flags & WRDE_NOCMD)
       return WRDE_CMDSUB;

      (*offset) += 2;
      return parse_comm (word, word_length, max_length, words, offset, flags,
                      quoted? NULL : pwordexp, ifs, ifs_white);

    case '[':
      (*offset) += 2;
      /* Call parse_arith -- 1 is for "brackets" */
      return parse_arith (word, word_length, max_length, words, offset, flags,
                       1);

    case '{':
    default:
      ++(*offset);   /* parse_param needs to know if "{" is there */
      return parse_param (word, word_length, max_length, words, offset, flags,
                        pwordexp, ifs, ifs_white, quoted);
    }
}

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static int internal_function parse_dquote ( char **  word,
size_t word_length,
size_t max_length,
const char *  words,
size_t offset,
int  flags,
wordexp_t pwordexp,
const char *  ifs,
const char *  ifs_white 
) [static]

Definition at line 2165 of file wordexp.c.

{
  /* We are poised just after a double-quote */
  int error;

  for (; words[*offset]; ++(*offset))
    {
      switch (words[*offset])
       {
       case '"':
         return 0;

       case '$':
         error = parse_dollars (word, word_length, max_length, words, offset,
                             flags, pwordexp, ifs, ifs_white, 1);
         /* The ``1'' here is to tell parse_dollars not to
          * split the fields.  It may need to, however ("$@").
          */
         if (error)
           return error;

         break;

       case '`':
         if (flags & WRDE_NOCMD)
           return WRDE_CMDSUB;

         ++(*offset);
         error = parse_backtick (word, word_length, max_length, words,
                              offset, flags, NULL, NULL, NULL);
         /* The first NULL here is to tell parse_backtick not to
          * split the fields.
          */
         if (error)
           return error;

         break;

       case '\\':
         error = parse_qtd_backslash (word, word_length, max_length, words,
                                   offset);

         if (error)
           return error;

         break;

       default:
         *word = w_addchar (*word, word_length, max_length, words[*offset]);
         if (*word == NULL)
           return WRDE_NOSPACE;
       }
    }

  /* Unterminated string */
  return WRDE_SYNTAX;
}

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static int internal_function parse_glob ( char **  word,
size_t word_length,
size_t max_length,
const char *  words,
size_t offset,
int  flags,
wordexp_t pwordexp,
const char *  ifs,
const char *  ifs_white 
) [static]

Definition at line 442 of file wordexp.c.

{
  /* We are poised just after a '*', a '[' or a '?'. */
  int error = WRDE_NOSPACE;
  int quoted = 0; /* 1 if singly-quoted, 2 if doubly */
  size_t i;
  wordexp_t glob_list; /* List of words to glob */

  glob_list.we_wordc = 0;
  glob_list.we_wordv = NULL;
  glob_list.we_offs = 0;
  for (; words[*offset] != '\0'; ++*offset)
    {
      if (strchr (ifs, words[*offset]) != NULL)
       /* Reached IFS */
       break;

      /* Sort out quoting */
      if (words[*offset] == '\'')
       {
         if (quoted == 0)
           {
             quoted = 1;
             continue;
           }
         else if (quoted == 1)
           {
             quoted = 0;
             continue;
           }
       }
      else if (words[*offset] == '"')
       {
         if (quoted == 0)
           {
             quoted = 2;
             continue;
           }
         else if (quoted == 2)
           {
             quoted = 0;
             continue;
           }
       }

      /* Sort out other special characters */
      if (quoted != 1 && words[*offset] == '$')
       {
         error = parse_dollars (word, word_length, max_length, words,
                             offset, flags, &glob_list, ifs, ifs_white,
                             quoted == 2);
         if (error)
           goto tidy_up;

         continue;
       }
      else if (words[*offset] == '\\')
       {
         if (quoted)
           error = parse_qtd_backslash (word, word_length, max_length,
                                    words, offset);
         else
           error = parse_backslash (word, word_length, max_length,
                                 words, offset);

         if (error)
           goto tidy_up;

         continue;
       }

      *word = w_addchar (*word, word_length, max_length, words[*offset]);
      if (*word == NULL)
       goto tidy_up;
    }

  /* Don't forget to re-parse the character we stopped at. */
  --*offset;

  /* Glob the words */
  error = w_addword (&glob_list, *word);
  *word = w_newword (word_length, max_length);
  for (i = 0; error == 0 && i < glob_list.we_wordc; i++)
    error = do_parse_glob (glob_list.we_wordv[i], word, word_length,
                        max_length, pwordexp, ifs, ifs_white);

  /* Now tidy up */
tidy_up:
  wordfree (&glob_list);
  return error;
}

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static int internal_function parse_param ( char **  word,
size_t word_length,
size_t max_length,
const char *  words,
size_t offset,
int  flags,
wordexp_t pwordexp,
const char *  ifs,
const char *  ifs_white,
int  quoted 
) [static]

Definition at line 1211 of file wordexp.c.

{
  /* We are poised just after "$" */
  enum action
  {
    ACT_NONE,
    ACT_RP_SHORT_LEFT = '#',
    ACT_RP_LONG_LEFT = 'L',
    ACT_RP_SHORT_RIGHT = '%',
    ACT_RP_LONG_RIGHT = 'R',
    ACT_NULL_ERROR = '?',
    ACT_NULL_SUBST = '-',
    ACT_NONNULL_SUBST = '+',
    ACT_NULL_ASSIGN = '='
  };
  size_t env_length;
  size_t env_maxlen;
  size_t pat_length;
  size_t pat_maxlen;
  size_t start = *offset;
  char *env;
  char *pattern;
  char *value = NULL;
  enum action action = ACT_NONE;
  int depth = 0;
  int colon_seen = 0;
  int seen_hash = 0;
  int free_value = 0;
  int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
  int error;
  int special = 0;
  char buffer[21];
  int brace = words[*offset] == '{';

  env = w_newword (&env_length, &env_maxlen);
  pattern = w_newword (&pat_length, &pat_maxlen);

  if (brace)
    ++*offset;

  /* First collect the parameter name. */

  if (words[*offset] == '#')
    {
      seen_hash = 1;
      if (!brace)
       goto envsubst;
      ++*offset;
    }

  if (isalpha (words[*offset]) || words[*offset] == '_')
    {
      /* Normal parameter name. */
      do
       {
         env = w_addchar (env, &env_length, &env_maxlen,
                        words[*offset]);
         if (env == NULL)
           goto no_space;
       }
      while (isalnum (words[++*offset]) || words[*offset] == '_');
    }
  else if (isdigit (words[*offset]))
    {
      /* Numeric parameter name. */
      special = 1;
      do
       {
         env = w_addchar (env, &env_length, &env_maxlen,
                        words[*offset]);
         if (env == NULL)
           goto no_space;
         if (!brace)
           goto envsubst;
       }
      while (isdigit(words[++*offset]));
    }
  else if (strchr ("*@$", words[*offset]) != NULL)
    {
      /* Special parameter. */
      special = 1;
      env = w_addchar (env, &env_length, &env_maxlen,
                     words[*offset]);
      if (env == NULL)
       goto no_space;
      ++*offset;
    }
  else
    {
      if (brace)
       goto syntax;
    }

  if (brace)
    {
      /* Check for special action to be applied to the value. */
      switch (words[*offset])
       {
       case '}':
         /* Evaluate. */
         goto envsubst;

       case '#':
         action = ACT_RP_SHORT_LEFT;
         if (words[1 + *offset] == '#')
           {
             ++*offset;
             action = ACT_RP_LONG_LEFT;
           }
         break;

       case '%':
         action = ACT_RP_SHORT_RIGHT;
         if (words[1 + *offset] == '%')
           {
             ++*offset;
             action = ACT_RP_LONG_RIGHT;
           }
         break;

       case ':':
         if (strchr ("-=?+", words[1 + *offset]) == NULL)
           goto syntax;

         colon_seen = 1;
         action = words[++*offset];
         break;

       case '-':
       case '=':
       case '?':
       case '+':
         action = words[*offset];
         break;

       default:
         goto syntax;
       }

      /* Now collect the pattern, but don't expand it yet. */
      ++*offset;
      for (; words[*offset]; ++(*offset))
       {
         switch (words[*offset])
           {
           case '{':
             if (!pattern_is_quoted)
              ++depth;
             break;

           case '}':
             if (!pattern_is_quoted)
              {
                if (depth == 0)
                  goto envsubst;
                --depth;
              }
             break;

           case '\\':
             if (pattern_is_quoted)
              /* Quoted; treat as normal character. */
              break;

             /* Otherwise, it's an escape: next character is literal. */
             if (words[++*offset] == '\0')
              goto syntax;

             pattern = w_addchar (pattern, &pat_length, &pat_maxlen, '\\');
             if (pattern == NULL)
              goto no_space;

             break;

           case '\'':
             if (pattern_is_quoted == 0)
              pattern_is_quoted = 1;
             else if (pattern_is_quoted == 1)
              pattern_is_quoted = 0;

             break;

           case '"':
             if (pattern_is_quoted == 0)
              pattern_is_quoted = 2;
             else if (pattern_is_quoted == 2)
              pattern_is_quoted = 0;

             break;
           }

         pattern = w_addchar (pattern, &pat_length, &pat_maxlen,
                            words[*offset]);
         if (pattern == NULL)
           goto no_space;
       }
    }

  /* End of input string -- remember to reparse the character that we
   * stopped at.  */
  --(*offset);

envsubst:
  if (words[start] == '{' && words[*offset] != '}')
    goto syntax;

  if (env == NULL)
    {
      if (seen_hash)
       {
         /* $# expands to the number of positional parameters */
         buffer[20] = '\0';
         value = _itoa_word (__libc_argc - 1, &buffer[20], 10, 0);
         seen_hash = 0;
       }
      else
       {
         /* Just $ on its own */
         *offset = start - 1;
         *word = w_addchar (*word, word_length, max_length, '$');
         return *word ? 0 : WRDE_NOSPACE;
       }
    }
  /* Is it a numeric parameter? */
  else if (isdigit (env[0]))
    {
      int n = atoi (env);

      if (n >= __libc_argc)
       /* Substitute NULL. */
       value = NULL;
      else
       /* Replace with appropriate positional parameter. */
       value = __libc_argv[n];
    }
  /* Is it a special parameter? */
  else if (special)
    {
      /* Is it `$$'? */
      if (*env == '$')
       {
         buffer[20] = '\0';
         value = _itoa_word (__getpid (), &buffer[20], 10, 0);
       }
      /* Is it `${#*}' or `${#@}'? */
      else if ((*env == '*' || *env == '@') && seen_hash)
       {
         buffer[20] = '\0';
         value = _itoa_word (__libc_argc > 0 ? __libc_argc - 1 : 0,
                           &buffer[20], 10, 0);
         *word = w_addstr (*word, word_length, max_length, value);
         free (env);
         free (pattern);
         return *word ? 0 : WRDE_NOSPACE;
       }
      /* Is it `$*' or `$@' (unquoted) ? */
      else if (*env == '*' || (*env == '@' && !quoted))
       {
         size_t plist_len = 0;
         int p;
         char *end;

         /* Build up value parameter by parameter (copy them) */
         for (p = 1; __libc_argv[p]; ++p)
           plist_len += strlen (__libc_argv[p]) + 1; /* for space */
         value = malloc (plist_len);
         if (value == NULL)
           goto no_space;
         end = value;
         *end = 0;
         for (p = 1; __libc_argv[p]; ++p)
           {
             if (p > 1)
              *end++ = ' ';
             end = __stpcpy (end, __libc_argv[p]);
           }

         free_value = 1;
       }
      else
       {
         /* Must be a quoted `$@' */
         assert (*env == '@' && quoted);

         /* Each parameter is a separate word ("$@") */
         if (__libc_argc == 2)
           value = __libc_argv[1];
         else if (__libc_argc > 2)
           {
             int p;

             /* Append first parameter to current word. */
             value = w_addstr (*word, word_length, max_length,
                            __libc_argv[1]);
             if (value == NULL || w_addword (pwordexp, value))
              goto no_space;

             for (p = 2; __libc_argv[p + 1]; p++)
              {
                char *newword = __strdup (__libc_argv[p]);
                if (newword == NULL || w_addword (pwordexp, newword))
                  goto no_space;
              }

             /* Start a new word with the last parameter. */
             *word = w_newword (word_length, max_length);
             value = __libc_argv[p];
           }
         else
           {
             free (env);
             free (pattern);
             return 0;
           }
       }
    }
  else
    value = getenv (env);

  if (value == NULL && (flags & WRDE_UNDEF))
    {
      /* Variable not defined. */
      error = WRDE_BADVAL;
      goto do_error;
    }

  if (action != ACT_NONE)
    {
      int expand_pattern = 0;

      /* First, find out if we need to expand pattern (i.e. if we will
       * use it). */
      switch (action)
       {
       case ACT_RP_SHORT_LEFT:
       case ACT_RP_LONG_LEFT:
       case ACT_RP_SHORT_RIGHT:
       case ACT_RP_LONG_RIGHT:
         /* Always expand for these. */
         expand_pattern = 1;
         break;

       case ACT_NULL_ERROR:
       case ACT_NULL_SUBST:
       case ACT_NULL_ASSIGN:
         if (!value || (!*value && colon_seen))
           /* If param is unset, or set but null and a colon has been seen,
              the expansion of the pattern will be needed. */
           expand_pattern = 1;

         break;

       case ACT_NONNULL_SUBST:
         /* Expansion of word will be needed if parameter is set and not null,
            or set null but no colon has been seen. */
         if (value && (*value || !colon_seen))
           expand_pattern = 1;

         break;

       default:
         assert (! "Unrecognised action!");
       }

      if (expand_pattern)
       {
         /* We need to perform tilde expansion, parameter expansion,
             command substitution, and arithmetic expansion.  We also
            have to be a bit careful with wildcard characters, as
            pattern might be given to fnmatch soon.  To do this, we
            convert quotes to escapes. */

         char *expanded;
         size_t exp_len;
         size_t exp_maxl;
         char *p;
         int quoted = 0; /* 1: single quotes; 2: double */

         expanded = w_newword (&exp_len, &exp_maxl);
         for (p = pattern; p && *p; p++)
           {
             size_t offset;

             switch (*p)
              {
              case '"':
                if (quoted == 2)
                  quoted = 0;
                else if (quoted == 0)
                  quoted = 2;
                else break;

                continue;

              case '\'':
                if (quoted == 1)
                  quoted = 0;
                else if (quoted == 0)
                  quoted = 1;
                else break;

                continue;

              case '*':
              case '?':
                if (quoted)
                  {
                    /* Convert quoted wildchar to escaped wildchar. */
                    expanded = w_addchar (expanded, &exp_len,
                                       &exp_maxl, '\\');

                    if (expanded == NULL)
                     goto no_space;
                  }
                break;

              case '$':
                offset = 0;
                error = parse_dollars (&expanded, &exp_len, &exp_maxl, p,
                                    &offset, flags, NULL, NULL, NULL, 1);
                if (error)
                  {
                    if (free_value)
                     free (value);

                    free (expanded);

                    goto do_error;
                  }

                p += offset;
                continue;

              case '~':
                if (quoted || exp_len)
                  break;

                offset = 0;
                error = parse_tilde (&expanded, &exp_len, &exp_maxl, p,
                                   &offset, 0);
                if (error)
                  {
                    if (free_value)
                     free (value);

                    free (expanded);

                    goto do_error;
                  }

                p += offset;
                continue;

              case '\\':
                expanded = w_addchar (expanded, &exp_len, &exp_maxl, '\\');
                ++p;
                assert (*p); /* checked when extracted initially */
                if (expanded == NULL)
                  goto no_space;
              }

             expanded = w_addchar (expanded, &exp_len, &exp_maxl, *p);

             if (expanded == NULL)
              goto no_space;
           }

         free (pattern);

         pattern = expanded;
       }

      switch (action)
       {
       case ACT_RP_SHORT_LEFT:
       case ACT_RP_LONG_LEFT:
       case ACT_RP_SHORT_RIGHT:
       case ACT_RP_LONG_RIGHT:
         {
           char *p;
           char c;
           char *end;

           if (value == NULL || pattern == NULL || *pattern == '\0')
             break;

           end = value + strlen (value);

           switch (action)
             {
             case ACT_RP_SHORT_LEFT:
              for (p = value; p <= end; ++p)
                {
                  c = *p;
                  *p = '\0';
                  if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
                    {
                     *p = c;
                     if (free_value)
                       {
                         char *newval = __strdup (p);
                         if (newval == NULL)
                           {
                            free (value);
                            goto no_space;
                           }
                         free (value);
                         value = newval;
                       }
                     else
                       value = p;
                     break;
                    }
                  *p = c;
                }

              break;

             case ACT_RP_LONG_LEFT:
              for (p = end; p >= value; --p)
                {
                  c = *p;
                  *p = '\0';
                  if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
                    {
                     *p = c;
                     if (free_value)
                       {
                         char *newval = __strdup (p);
                         if (newval == NULL)
                           {
                            free (value);
                            goto no_space;
                           }
                         free (value);
                         value = newval;
                       }
                     else
                       value = p;
                     break;
                    }
                  *p = c;
                }

              break;

             case ACT_RP_SHORT_RIGHT:
              for (p = end; p >= value; --p)
                {
                  if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
                    {
                     char *newval;
                     newval = malloc (p - value + 1);

                     if (newval == NULL)
                       {
                         if (free_value)
                           free (value);
                         goto no_space;
                       }

                     *(char *) __mempcpy (newval, value, p - value) = '\0';
                     if (free_value)
                       free (value);
                     value = newval;
                     free_value = 1;
                     break;
                    }
                }

              break;

             case ACT_RP_LONG_RIGHT:
              for (p = value; p <= end; ++p)
                {
                  if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
                    {
                     char *newval;
                     newval = malloc (p - value + 1);

                     if (newval == NULL)
                       {
                         if (free_value)
                           free (value);
                         goto no_space;
                       }

                     *(char *) __mempcpy (newval, value, p - value) = '\0';
                     if (free_value)
                       free (value);
                     value = newval;
                     free_value = 1;
                     break;
                    }
                }

              break;

             default:
              break;
             }

           break;
         }

       case ACT_NULL_ERROR:
         if (value && *value)
           /* Substitute parameter */
           break;

         error = 0;
         if (!colon_seen && value)
           /* Substitute NULL */
           ;
         else
           {
             const char *str = pattern;

             if (str[0] == '\0')
              str = _("parameter null or not set");

             __fxprintf (NULL, "%s: %s\n", env, str);
           }

         if (free_value)
           free (value);
         goto do_error;

       case ACT_NULL_SUBST:
         if (value && *value)
           /* Substitute parameter */
           break;

         if (free_value)
           free (value);

         if (!colon_seen && value)
           /* Substitute NULL */
           goto success;

         value = pattern ? __strdup (pattern) : pattern;
         free_value = 1;

         if (pattern && !value)
           goto no_space;

         break;

       case ACT_NONNULL_SUBST:
         if (value && (*value || !colon_seen))
           {
             if (free_value)
              free (value);

             value = pattern ? __strdup (pattern) : pattern;
             free_value = 1;

             if (pattern && !value)
              goto no_space;

             break;
           }

         /* Substitute NULL */
         if (free_value)
           free (value);
         goto success;

       case ACT_NULL_ASSIGN:
         if (value && *value)
           /* Substitute parameter */
           break;

         if (!colon_seen && value)
           {
             /* Substitute NULL */
             if (free_value)
              free (value);
             goto success;
           }

         if (free_value)
           free (value);

         value = pattern ? __strdup (pattern) : pattern;
         free_value = 1;

         if (pattern && !value)
           goto no_space;

         __setenv (env, value, 1);
         break;

       default:
         assert (! "Unrecognised action!");
       }
    }

  free (env);
  env = NULL;
  free (pattern);
  pattern = NULL;

  if (seen_hash)
    {
      char param_length[21];
      param_length[20] = '\0';
      *word = w_addstr (*word, word_length, max_length,
                     _itoa_word (value ? strlen (value) : 0,
                                &param_length[20], 10, 0));
      if (free_value)
       {
         assert (value != NULL);
         free (value);
       }

      return *word ? 0 : WRDE_NOSPACE;
    }

  if (value == NULL)
    return 0;

  if (quoted || !pwordexp)
    {
      /* Quoted - no field split */
      *word = w_addstr (*word, word_length, max_length, value);
      if (free_value)
       free (value);

      return *word ? 0 : WRDE_NOSPACE;
    }
  else
    {
      /* Need to field-split */
      char *value_copy = __strdup (value); /* Don't modify value */
      char *field_begin = value_copy;
      int seen_nonws_ifs = 0;

      if (free_value)
       free (value);

      if (value_copy == NULL)
       goto no_space;

      do
       {
         char *field_end = field_begin;
         char *next_field;

         /* If this isn't the first field, start a new word */
         if (field_begin != value_copy)
           {
             if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
              {
                free (value_copy);
                goto no_space;
              }

             *word = w_newword (word_length, max_length);
           }

         /* Skip IFS whitespace before the field */
         field_begin += strspn (field_begin, ifs_white);

         if (!seen_nonws_ifs && *field_begin == 0)
           /* Nothing but whitespace */
           break;

         /* Search for the end of the field */
         field_end = field_begin + strcspn (field_begin, ifs);

         /* Set up pointer to the character after end of field and
             skip whitespace IFS after it. */
         next_field = field_end + strspn (field_end, ifs_white);

         /* Skip at most one non-whitespace IFS character after the field */
         seen_nonws_ifs = 0;
         if (*next_field && strchr (ifs, *next_field))
           {
             seen_nonws_ifs = 1;
             next_field++;
           }

         /* Null-terminate it */
         *field_end = 0;

         /* Tag a copy onto the current word */
         *word = w_addstr (*word, word_length, max_length, field_begin);

         if (*word == NULL && *field_begin != '\0')
           {
             free (value_copy);
             goto no_space;
           }

         field_begin = next_field;
       }
      while (seen_nonws_ifs || *field_begin);

      free (value_copy);
    }

  return 0;

success:
  error = 0;
  goto do_error;

no_space:
  error = WRDE_NOSPACE;
  goto do_error;

syntax:
  error = WRDE_SYNTAX;

do_error:
  free (env);

  free (pattern);

  return error;
}

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static int internal_function parse_qtd_backslash ( char **  word,
size_t word_length,
size_t max_length,
const char *  words,
size_t offset 
) [static]

Definition at line 235 of file wordexp.c.

{
  /* We are poised _at_ a backslash, inside quotes */

  switch (words[1 + *offset])
    {
    case 0:
      /* Backslash is last character of input words */
      return WRDE_SYNTAX;

    case '\n':
      ++(*offset);
      break;

    case '$':
    case '`':
    case '"':
    case '\\':
      *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
      if (*word == NULL)
       return WRDE_NOSPACE;

      ++(*offset);
      break;

    default:
      *word = w_addchar (*word, word_length, max_length, words[*offset]);
      if (*word != NULL)
       *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);

      if (*word == NULL)
       return WRDE_NOSPACE;

      ++(*offset);
      break;
    }

  return 0;
}

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static int internal_function parse_squote ( char **  word,
size_t word_length,
size_t max_length,
const char *  words,
size_t offset 
) [static]

Definition at line 538 of file wordexp.c.

{
  /* We are poised just after a single quote */
  for (; words[*offset]; ++(*offset))
    {
      if (words[*offset] != '\'')
       {
         *word = w_addchar (*word, word_length, max_length, words[*offset]);
         if (*word == NULL)
           return WRDE_NOSPACE;
       }
      else return 0;
    }

  /* Unterminated string */
  return WRDE_SYNTAX;
}

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static int internal_function parse_tilde ( char **  word,
size_t word_length,
size_t max_length,
const char *  words,
size_t offset,
size_t  wordc 
) [static]

Definition at line 278 of file wordexp.c.

{
  /* We are poised _at_ a tilde */
  size_t i;

  if (*word_length != 0)
    {
      if (!((*word)[*word_length - 1] == '=' && wordc == 0))
       {
         if (!((*word)[*word_length - 1] == ':'
              && strchr (*word, '=') && wordc == 0))
           {
             *word = w_addchar (*word, word_length, max_length, '~');
             return *word ? 0 : WRDE_NOSPACE;
           }
       }
    }

  for (i = 1 + *offset; words[i]; i++)
    {
      if (words[i] == ':' || words[i] == '/' || words[i] == ' ' ||
         words[i] == '\t' || words[i] == 0 )
       break;

      if (words[i] == '\\')
       {
         *word = w_addchar (*word, word_length, max_length, '~');
         return *word ? 0 : WRDE_NOSPACE;
       }
    }

  if (i == 1 + *offset)
    {
      /* Tilde appears on its own */
      uid_t uid;
      struct passwd pwd, *tpwd;
      int buflen = 1000;
      char* home;
      char* buffer;
      int result;

      /* POSIX.2 says ~ expands to $HOME and if HOME is unset the
        results are unspecified.  We do a lookup on the uid if
        HOME is unset. */

      home = getenv ("HOME");
      if (home != NULL)
       {
         *word = w_addstr (*word, word_length, max_length, home);
         if (*word == NULL)
           return WRDE_NOSPACE;
       }
      else
       {
         uid = __getuid ();
         buffer = __alloca (buflen);

         while ((result = __getpwuid_r (uid, &pwd, buffer, buflen, &tpwd)) != 0
               && errno == ERANGE)
           buffer = extend_alloca (buffer, buflen, buflen + 1000);

         if (result == 0 && tpwd != NULL && pwd.pw_dir != NULL)
           {
             *word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
             if (*word == NULL)
              return WRDE_NOSPACE;
           }
         else
           {
             *word = w_addchar (*word, word_length, max_length, '~');
             if (*word == NULL)
              return WRDE_NOSPACE;
           }
       }
    }
  else
    {
      /* Look up user name in database to get home directory */
      char *user = strndupa (&words[1 + *offset], i - (1 + *offset));
      struct passwd pwd, *tpwd;
      int buflen = 1000;
      char* buffer = __alloca (buflen);
      int result;

      while ((result = __getpwnam_r (user, &pwd, buffer, buflen, &tpwd)) != 0
            && errno == ERANGE)
       buffer = extend_alloca (buffer, buflen, buflen + 1000);

      if (result == 0 && tpwd != NULL && pwd.pw_dir)
       *word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
      else
       {
         /* (invalid login name) */
         *word = w_addchar (*word, word_length, max_length, '~');
         if (*word != NULL)
           *word = w_addstr (*word, word_length, max_length, user);
       }

      *offset = i - 1;
    }
  return *word ? 0 : WRDE_NOSPACE;
}

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static char* w_addchar ( char *  buffer,
size_t actlen,
size_t maxlen,
char  ch 
) [static]

Definition at line 96 of file wordexp.c.

{
  /* Add a character to the buffer, allocating room for it if needed.  */

  if (*actlen == *maxlen)
    {
      char *old_buffer = buffer;
      assert (buffer == NULL || *maxlen != 0);
      *maxlen += W_CHUNK;
      buffer = (char *) realloc (buffer, 1 + *maxlen);

      if (buffer == NULL)
       free (old_buffer);
    }

  if (buffer != NULL)
    {
      buffer[*actlen] = ch;
      buffer[++(*actlen)] = '\0';
    }

  return buffer;
}

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static char* internal_function w_addmem ( char *  buffer,
size_t actlen,
size_t maxlen,
const char *  str,
size_t  len 
) [static]

Definition at line 123 of file wordexp.c.

{
  /* Add a string to the buffer, allocating room for it if needed.
   */
  if (*actlen + len > *maxlen)
    {
      char *old_buffer = buffer;
      assert (buffer == NULL || *maxlen != 0);
      *maxlen += MAX (2 * len, W_CHUNK);
      buffer = realloc (old_buffer, 1 + *maxlen);

      if (buffer == NULL)
       free (old_buffer);
    }

  if (buffer != NULL)
    {
      *((char *) __mempcpy (&buffer[*actlen], str, len)) = '\0';
      *actlen += len;
    }

  return buffer;
}

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static char* internal_function w_addstr ( char *  buffer,
size_t actlen,
size_t maxlen,
const char *  str 
) [static]

Definition at line 150 of file wordexp.c.

{
  /* Add a string to the buffer, allocating room for it if needed.
   */
  size_t len;

  assert (str != NULL); /* w_addstr only called from this file */
  len = strlen (str);

  return w_addmem (buffer, actlen, maxlen, str, len);
}

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static int internal_function w_addword ( wordexp_t pwordexp,
char *  word 
) [static]

Definition at line 165 of file wordexp.c.

{
  /* Add a word to the wordlist */
  size_t num_p;
  char **new_wordv;
  bool allocated = false;

  /* Internally, NULL acts like "".  Convert NULLs to "" before
   * the caller sees them.
   */
  if (word == NULL)
    {
      word = __strdup ("");
      if (word == NULL)
       goto no_space;
      allocated = true;
    }

  num_p = 2 + pwordexp->we_wordc + pwordexp->we_offs;
  new_wordv = realloc (pwordexp->we_wordv, sizeof (char *) * num_p);
  if (new_wordv != NULL)
    {
      pwordexp->we_wordv = new_wordv;
      pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc++] = word;
      pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc] = NULL;
      return 0;
    }

  if (allocated)
    free (word);

no_space:
  return WRDE_NOSPACE;
}

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static char* w_newword ( size_t actlen,
size_t maxlen 
) [inline, static]

Definition at line 89 of file wordexp.c.

{
  *actlen = *maxlen = 0;
  return NULL;
}

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void wordfree ( wordexp_t pwordexp)

Definition at line 2230 of file wordexp.c.

{

  /* wordexp can set pwordexp to NULL */
  if (pwordexp && pwordexp->we_wordv)
    {
      char **wordv = pwordexp->we_wordv;

      for (wordv += pwordexp->we_offs; *wordv; ++wordv)
       free (*wordv);

      free (pwordexp->we_wordv);
      pwordexp->we_wordv = NULL;
    }
}

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Variable Documentation

Definition at line 63 of file wordexp.c.