src/str.c

   1 /* append a string */
   2 /* Copyright (c) Olly Betts 1999, 2014, 2024
   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 <config.h>
  20
  21 #include "str.h"
  22
  23 #include <string.h>
  24
  25 #include "osalloc.h"
  26
  27 void s_expand_(string *pstr, int addition) {
  28     int new_size = (pstr->len + addition + 33) & ~7;
  29     pstr->s = osrealloc(pstr->s, new_size);
  30     pstr->capacity = new_size - 1;
  31 }
  32
  33 void
  34 s_appendlen(string* pstr, const char *s, int s_len)
  35 {
  36    if (pstr->capacity - pstr->len < s_len || s_len == 0)
  37        s_expand_(pstr, s_len);
  38    memcpy(pstr->s + pstr->len, s, s_len);
  39    pstr->len += s_len;
  40 }
  41
  42 void
  43 s_appendn(string *pstr, int n, char c)
  44 {
  45    if (pstr->capacity - pstr->len < n || n == 0)
  46        s_expand_(pstr, n);
  47    memset(pstr->s + pstr->len, c, n);
  48    pstr->len += n;
  49 }