git.ozlabs.org Git - ccan/blob - ccan/stringbuilder/stringbuilder.c

   1 /* CC0 (Public domain) - see LICENSE file for details */
   2 #include <ccan/stringbuilder/stringbuilder.h>
   3 #include <string.h>
   4 #include <errno.h>
   5
   6 int stringbuilder_args(char* str, size_t str_sz, const char* delim, ...)
   7 {
   8         int res;
   9         va_list ap;
  10         va_start(ap, delim);
  11         res = stringbuilder_va(str, str_sz, delim, ap);
  12         va_end(ap);
  13         return res;
  14 }
  15
  16 static int stringbuilder_cpy(
  17                 char** str, size_t* str_sz, const char* s, size_t s_len)
  18 {
  19         if (!s)
  20                 return 0;
  21
  22         if (*str != s) {
  23                 if (!s_len)
  24                         s_len = strlen(s);
  25                 /* Include nul term! */
  26                 if (s_len >= *str_sz)
  27                         return EMSGSIZE;
  28                 strcpy(*str, s);
  29         }
  30         *str += s_len;
  31         *str_sz -= s_len;
  32         return 0;
  33 }
  34
  35 int stringbuilder_va(char* str, size_t str_sz, const char* delim, va_list ap)
  36 {
  37         int res = 0;
  38         size_t delim_len = 0;
  39         const char* s = va_arg(ap, const char*);
  40
  41         if (delim)
  42                 delim_len = strlen(delim);
  43
  44         res = stringbuilder_cpy(&str, &str_sz, s, 0);
  45         s = va_arg(ap, const char*);
  46         while(s && !res) {
  47                 res = stringbuilder_cpy(&str, &str_sz,
  48                                 delim, delim_len);
  49                 if (!res) {
  50                         res = stringbuilder_cpy(&str, &str_sz,
  51                                                 s, 0);
  52                         s = va_arg(ap, const char*);
  53                 }
  54         }
  55         return res;
  56 }
  57
  58 int stringbuilder_array(char* str, size_t str_sz, const char* delim,
  59                 size_t n_strings, const char** strings)
  60 {
  61         int res = 0;
  62         size_t delim_len = 0;
  63
  64         if (delim)
  65                 delim_len = strlen(delim);
  66
  67         res = stringbuilder_cpy(&str, &str_sz,
  68                         *(strings++), 0);
  69         while(--n_strings && !res) {
  70                 res = stringbuilder_cpy(&str, &str_sz,
  71                                 delim, delim_len);
  72                 if (!res)
  73                         res = stringbuilder_cpy(&str, &str_sz,
  74                                         *(strings++), 0);
  75         }
  76         return res;
  77
  78 }