Back to index

cell-binutils  2.17cvs20070401
Defines | Functions
strtoul.c File Reference
#include <errno.h>
#include "ansidecl.h"
#include "safe-ctype.h"

Go to the source code of this file.

Defines

#define ULONG_MAX   ((unsigned long)(~0L)) /* 0xFFFFFFFF */

Functions

unsigned long strtoul (const char *nptr, char **endptr, register int base)

Define Documentation

#define ULONG_MAX   ((unsigned long)(~0L)) /* 0xFFFFFFFF */

Definition at line 51 of file strtoul.c.


Function Documentation

unsigned long strtoul ( const char *  nptr,
char **  endptr,
register int  base 
)

Definition at line 61 of file strtoul.c.

{
       register const char *s = nptr;
       register unsigned long acc;
       register int c;
       register unsigned long cutoff;
       register int neg = 0, any, cutlim;

       /*
        * See strtol for comments as to the logic used.
        */
       do {
              c = *s++;
       } while (ISSPACE(c));
       if (c == '-') {
              neg = 1;
              c = *s++;
       } else if (c == '+')
              c = *s++;
       if ((base == 0 || base == 16) &&
           c == '0' && (*s == 'x' || *s == 'X')) {
              c = s[1];
              s += 2;
              base = 16;
       }
       if (base == 0)
              base = c == '0' ? 8 : 10;
       cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
       cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
       for (acc = 0, any = 0;; c = *s++) {
              if (ISDIGIT(c))
                     c -= '0';
              else if (ISALPHA(c))
                     c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10;
              else
                     break;
              if (c >= base)
                     break;
              if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
                     any = -1;
              else {
                     any = 1;
                     acc *= base;
                     acc += c;
              }
       }
       if (any < 0) {
              acc = ULONG_MAX;
              errno = ERANGE;
       } else if (neg)
              acc = -acc;
       if (endptr != 0)
              *endptr = (char *) (any ? s - 1 : nptr);
       return (acc);
}

Here is the caller graph for this function: