Logo Search packages:      
Sourcecode: l7-protocols version File versions  Download package

regsub.c

/*
 * regsub
 * @(#)regsub.c   1.3 of 2 April 86
 *
 *    Copyright (c) 1986 by University of Toronto.
 *    Written by Henry Spencer.  Not derived from licensed software.
 *
 *    Permission is granted to anyone to use this software for any
 *    purpose on any computer system, and to redistribute it freely,
 *    subject to the following restrictions:
 *
 *    1. The author is not responsible for the consequences of use of
 *          this software, no matter how awful, even if they arise
 *          from defects in it.
 *
 *    2. The origin of this software must not be misrepresented, either
 *          by explicit claim or by omission.
 *
 *    3. Altered versions must be plainly marked as such, and must not
 *          be misrepresented as being the original software.
 *
 *
 * This code was modified by Ethan Sommer to work within the kernel
 * (it now uses kmalloc etc..)
 *
 */
#include "regexp.h"
#include "regmagic.h"
#include <linux/string.h>


#ifndef CHARBITS
#define     UCHARAT(p)  ((int)*(unsigned char *)(p))
#else
#define     UCHARAT(p)  ((int)*(p)&CHARBITS)
#endif

#if 0
//void regerror(char * s)
//{
//        printk("regexp(3): %s", s);
//        /* NOTREACHED */
//}
#endif

/*
 - regsub - perform substitutions after a regexp match
 */
void
regsub(regexp * prog, char * source, char * dest)
{
      register char *src;
      register char *dst;
      register char c;
      register int no;
      register int len;
      
      /* Not necessary and gcc doesn't like it -MLS */
      /*extern char *strncpy();*/

      if (prog == NULL || source == NULL || dest == NULL) {
            regerror("NULL parm to regsub");
            return;
      }
      if (UCHARAT(prog->program) != MAGIC) {
            regerror("damaged regexp fed to regsub");
            return;
      }

      src = source;
      dst = dest;
      while ((c = *src++) != '\0') {
            if (c == '&')
                  no = 0;
            else if (c == '\\' && '0' <= *src && *src <= '9')
                  no = *src++ - '0';
            else
                  no = -1;

            if (no < 0) {     /* Ordinary character. */
                  if (c == '\\' && (*src == '\\' || *src == '&'))
                        c = *src++;
                  *dst++ = c;
            } else if (prog->startp[no] != NULL && prog->endp[no] != NULL) {
                  len = prog->endp[no] - prog->startp[no];
                  (void) strncpy(dst, prog->startp[no], len);
                  dst += len;
                  if (len != 0 && *(dst-1) == '\0') { /* strncpy hit NUL. */
                        regerror("damaged match string");
                        return;
                  }
            }
      }
      *dst++ = '\0';
}

Generated by  Doxygen 1.6.0   Back to index