src/str.c

   1 /* append a string */
   2 /* Copyright (c) Olly Betts 1999, 2014
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include <string.h>
  20
  21 #include "osalloc.h"
  22 #include "str.h"
  23
  24 /* append a string */
  25 void
  26 s_cat(char **pstr, int *plen, const char *s)
  27 {
  28    s_catlen(pstr, plen, s, strlen(s));
  29 }
  30
  31 /* append a string with length */
  32 void
  33 s_catlen(char **pstr, int *plen, const char *s, int s_len)
  34 {
  35    int new_len = s_len + 1; /* extra 1 for nul */
  36    int len = 0;
  37
  38    if (*pstr) {
  39       len = strlen(*pstr);
  40       new_len += len;
  41    }
  42
  43    if (!*pstr || new_len > *plen) {
  44       *plen = (new_len + 32) & ~3;
  45       *pstr = osrealloc(*pstr, *plen);
  46    }
  47
  48    memcpy(*pstr + len, s, s_len);
  49    (*pstr + len)[s_len] = '\0';
  50 }
  51
  52 /* append a character */
  53 void
  54 s_catchar(char **pstr, int *plen, char ch)
  55 {
  56    int new_len = 2; /* extra 1 for nul */
  57    int len = 0;
  58
  59    if (*pstr) {
  60       len = strlen(*pstr);
  61       new_len += len;
  62    }
  63
  64    if (!*pstr || new_len > *plen) {
  65       *plen = (new_len + 32) & ~3;
  66       *pstr = osrealloc(*pstr, *plen);
  67    }
  68
  69    (*pstr)[len] = ch;
  70    (*pstr)[len + 1] = '\0';
  71 }