src/utils.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include "utils.h"
   4
   5 /* Concatenate two strings into newly allocated buffer.
   6  * You must free() them, when you don't need it anymore.
   7  * Any of the arguments can be NULL meaning empty string.
   8  * In case of error returns NULL.
   9  * Empty string is always returned as allocated empty string. */
  10 _hidden char *astrcat(const char *first, const char *second) {
  11     size_t first_len, second_len;
  12     char *buf;
  13
  14     first_len = (first) ? strlen(first) : 0;
  15     second_len = (second) ? strlen(second) : 0;
  16     buf = malloc(1 + first_len + second_len);
  17     if (buf) {
  18         buf[0] = '\0';
  19         if (first) strcpy(buf, first);
  20         if (second) strcpy(buf + first_len, second);
  21     }
  22     return buf;
  23 }
  24
  25
  26 /* Concatenate three strings into newly allocated buffer.
  27  * You must free() them, when you don't need it anymore.
  28  * Any of the arguments can be NULL meaning empty string.
  29  * In case of error returns NULL.
  30  * Empty string is always returned as allocated empty string. */
  31 _hidden char *astrcat3(const char *first, const char *second,
  32         const char *third) {
  33     size_t first_len, second_len, third_len;
  34     char *buf, *next;
  35
  36     first_len = (first) ? strlen(first) : 0;
  37     second_len = (second) ? strlen(second) : 0;
  38     third_len = (third) ? strlen(third) : 0;
  39     buf = malloc(1 + first_len + second_len + third_len);
  40     if (buf) {
  41         buf[0] = '\0';
  42         next = buf;
  43         if (first) {
  44             strcpy(next, first);
  45             next += first_len;
  46         }
  47         if (second) {
  48             strcpy(next, second);
  49             next += second_len;
  50         }
  51         if (third) {
  52             strcpy(next, third);
  53         }
  54     }
  55     return buf;
  56 }