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- /* xstring.c -- Code for needed string functions that might be missing. */
-
- /* Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Written by Tudor Hulubei and Andrei Pitis. strcasecmp() and strncasecmp()
- have been stolen from the GNU C library. */
-
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #include <sys/types.h>
- #include <ctype.h>
- #include <stddef.h>
-
- #include "xmalloc.h"
- #include "xstring.h"
-
-
- #ifndef HAVE_STRCASECMP
-
- int
- strcasecmp(s1, s2)
- const char *s1;
- const char *s2;
- {
- unsigned char c1, c2;
-
- if (s1 == s2)
- return 0;
-
- do
- {
- c1 = tolower(*s1++);
- c2 = tolower(*s2++);
-
- if (c1 == 0)
- break;
- }
- while (c1 == c2);
-
- return c1 - c2;
- }
-
- #endif /* !HAVE_STRCASECMP */
-
-
- #ifndef HAVE_STRNCASECMP
-
- /*
- * Compare no more than N characters of S1 and S2,
- * ignoring case, returning less than, equal to or
- * greater than zero if S1 is lexicographically less
- * than, equal to or greater than S2.
- */
-
- int
- strncasecmp(s1, s2, n)
- const char *s1;
- const char *s2;
- size_t n;
- {
- unsigned char c1, c2;
- register const unsigned char *p1 = (const unsigned char *) s1;
- register const unsigned char *p2 = (const unsigned char *) s2;
-
- if (p1 == p2 || n == 0)
- return 0;
-
- do
- {
- c1 = tolower (*p1++);
- c2 = tolower (*p2++);
- if (c1 == '\0' || c1 != c2)
- return c1 - c2;
- }
- while (--n > 0);
-
- return c1 - c2;
- }
-
- #endif /* !HAVE_STRNCASECMP */
-
-
- #ifndef HAVE_STRSTR
-
- /*
- * Return the first ocurrence of NEEDLE in HAYSTACK.
- */
-
- char *
- strstr(haystack, needle)
- const char *haystack;
- const char *needle;
- {
- register char *needle_end = strchr(needle, '\0');
- register char *haystack_end = strchr(haystack, '\0');
- register size_t needle_len = needle_end - needle;
- register size_t needle_last = needle_len - 1;
- register char *begin;
-
- if (needle_len == 0)
- return (char *) haystack; /* ANSI 4.11.5.7, line 25. */
-
- if ((size_t) (haystack_end - haystack) < needle_len)
- return NULL;
-
- for (begin = &haystack[needle_last]; begin < haystack_end; ++begin)
- {
- register char *n = &needle[needle_last];
- register char *h = begin;
-
- do
- if (*h != *n)
- goto loop; /* continue for loop */
- while (--n >= needle && --h >= haystack);
-
- return (char *) h;
-
- loop:;
- }
-
- return NULL;
- }
-
- #endif /* !HAVE_STRSTR */
-
-
- /*
- * A strdup() version that calls xmalloc instead of malloc, never returning
- * a NULL pointer.
- */
-
- char *
- xstrdup(s)
- const char *s;
- {
- size_t len = strlen(s) + 1;
- char *new_s = xmalloc(len);
-
- memcpy(new_s, s, len);
- return new_s;
- }
-
-
- #ifndef HAVE_MEMMOVE
-
- /* A slow but portable memmove function. For those loosing systems that
- don't have one. */
-
- void *
- memmove(dest, src, n)
- void *dest;
- const void *src;
- size_t n;
- {
- char *temp = xmalloc(n);
- memcpy(temp, src, n);
- memcpy(dest, temp, n);
- xfree(temp);
- return dest;
- }
-
- #endif /* !HAVE_MEMMOVE */
-