BUILD: add require-all build mode

[irc/quakenet/newserv.git] / lib / strlfunc.c

/*
 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <string.h>

/*\r
 * Appends src to string dst of size siz (unlike strncat, siz is the\r
 * full size of dst, not space left).  At most siz-1 characters\r
 * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).\r
 * Returns strlen(src) + MIN(siz, strlen(initial dst)).\r
 * If retval >= siz, truncation occurred.\r
 */\r
size_t strlcat(char *dst, const char *src, size_t siz) {\r
  register char *d = dst;\r
  register const char *s = src;\r
  register size_t n = siz;\r
  size_t dlen;\r
\r
  /* Find the end of dst and adjust bytes left but don't go past end */\r
  while((n-- != 0) && (*d != '\0'))\r
    d++;\r
  \r
  dlen = d - dst;\r
  n = siz - dlen;\r
\r
  if(!n)\r
    return dlen + strlen(s);\r
\r
  while(*s != '\0') {\r
    if(n != 1) {\r
      *d++ = *s;\r
      n--;\r
    }\r
    \r
    s++;\r
  }\r
  \r
  *d = '\0';\r
\r
  return dlen + (s - src);       /* count does not include NUL */\r
}\r

/*\r
 * Copy src to string dst of size siz.  At most siz-1 characters\r
 * will be copied.  Always NUL terminates (unless siz == 0).\r
 * Returns strlen(src); if retval >= siz, truncation occurred.\r
 */\r
size_t strlcpy(char *dst, const char *src, size_t siz) {\r
  register char *d = dst;\r
  register const char *s = src;\r
  register size_t n = siz;\r
\r
  /* Copy as many bytes as will fit */\r
  if((n != 0) && (--n != 0))\r
    do {\r
      if((*d++ = *s++) == 0)\r
        break;\r
    } while(--n);\r
\r
  /* Not enough room in dst, add NUL and traverse rest of src */\r
  if (n == 0) {\r
    if (siz != 0)\r
      *d = '\0';              /* NUL-terminate dst */\r
    while(*s++) {\r
      /* Empty while */\r
    };\r
  }\r
\r
  return s - src - 1;    /* count does not include NUL */\r
}\r