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lightning-sunbird  0.9+nobinonly
Functions | Variables
mangle.c File Reference
#include "nspr.h"
#include "plstr.h"
#include "plgetopt.h"
#include "prio.h"

Go to the source code of this file.

Functions

static void usage (char *program_name)
int main (int argc, char **argv)
 The Xalan testcases app.

Variables

static PRFileDescpr_stderr

Function Documentation

int main ( int  argc,
char **  argv 
)

The Xalan testcases app.

Definition at line 59 of file mangle.c.

{
    /* buffers and locals */
    PLOptState       *optstate;
    char      *programName;
    char      cbuf;

    /* parameter set variables */
    const char  *libFile = NULL;   
    int offset = -1;
    int bitOffset = -1;

    /* return values */
    int               retval = 2;  /* 0 - test succeeded.
                            * 1 - illegal args 
                            * 2 - function failed */
    PRFileDesc *fd;
    int bytesRead;
    int bytesWritten;
    int pos;

    programName = PL_strrchr(argv[0], '/');
    programName = programName ? (programName + 1) : argv[0];

    pr_stderr = PR_STDERR;

    optstate = PL_CreateOptState (argc, argv, "i:o:b:");
    if (optstate == NULL) {
       return 1;
    }

    while (PL_GetNextOpt (optstate) == PL_OPT_OK) {
       switch (optstate->option) {
          case 'i':
            libFile = optstate->value;
            break;

          case 'o':
            offset = atoi(optstate->value);
            break;

          case 'b':
            bitOffset = atoi(optstate->value);
            break;
       }
    }

    if (libFile == NULL) {
       usage(programName);
       return 1;
    }
    if ((bitOffset >= 8) || (bitOffset < 0)) {
       usage(programName);
       return 1;
    }

    if (offset < 0) {
       usage(programName);
       return 1;
    }

    /* open the target signature file */
    fd = PR_OpenFile(libFile,PR_RDWR,0666);
    if (fd == NULL ) {
       /* lperror(libFile); */
       PR_fprintf(pr_stderr,"Couldn't Open %s\n",libFile);
       goto loser;
    }

    /* read the byte */
    pos = PR_Seek(fd, offset, PR_SEEK_SET);
    if (pos != offset) {
       PR_fprintf(pr_stderr,"Seek for read on %s (to %d) failed\n", libFile, offset);
       goto loser;
    }
    bytesRead = PR_Read(fd, &cbuf, 1);
    if (bytesRead != 1) {
       PR_fprintf(pr_stderr,"Read on %s (to %d) failed\n", libFile, offset);
       goto loser;
    }

    PR_fprintf(pr_stderr,"Changing byte 0x%08x (%d): from %02x (%d) to ", 
              offset, offset, (unsigned char)cbuf, (unsigned char)cbuf);
    /* change it */
    cbuf ^= 1 << bitOffset;
    PR_fprintf(pr_stderr,"%02x (%d)\n", (
                            unsigned char)cbuf, (unsigned char)cbuf);

    /* write it back out */
    pos = PR_Seek(fd, offset, PR_SEEK_SET);
    if (pos != offset) {
       PR_fprintf(pr_stderr,"Seek for write on %s (to %d) failed\n", libFile, offset);
       goto loser;
    }
    bytesWritten = PR_Write(fd, &cbuf, 1);
    if (bytesWritten != 1) {
       PR_fprintf(pr_stderr,"Write on %s (to %d) failed\n", libFile, offset);
       goto loser;
    }

    PR_Close(fd);
    retval = 0;


loser:

    PR_Cleanup ();
    return retval;
}

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static void usage ( char *  program_name) [static]

Definition at line 50 of file mangle.c.

{

    PR_fprintf (pr_stderr, "Usage:");
    PR_fprintf (pr_stderr, "%s -i shared_library_name -o byte_offset -b bit\n", program_name);
}

Variable Documentation

PRFileDesc* pr_stderr [static]

Definition at line 48 of file mangle.c.