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                 if (s_len > *str_sz)
  26                         return EMSGSIZE;
  27                 strcpy(*str, s);
  28         }
  29         *str += s_len;
  30         *str_sz -= s_len;
  31         return 0;
  32 }
  33
  34 int stringbuilder_va(char* str, size_t str_sz, const char* delim, va_list ap)
  35 {
  36         int res = 0;
  37         size_t delim_len = 0;
  38         const char* s = va_arg(ap, const char*);
  39
  40         if (delim)
  41                 delim_len = strlen(delim);
  42
  43         res = stringbuilder_cpy(&str, &str_sz, s, 0);
  44         s = va_arg(ap, const char*);
  45         while(s && !res) {
  46                 res = stringbuilder_cpy(&str, &str_sz,
  47                                 delim, delim_len);
  48                 if (!res) {
  49                         res = stringbuilder_cpy(&str, &str_sz,
  50                                                 s, 0);
  51                         s = va_arg(ap, const char*);
  52                 }
  53         }
  54         return res;
  55 }
  56
  57 int stringbuilder_array(char* str, size_t str_sz, const char* delim,
  58                 size_t n_strings, const char** strings)
  59 {
  60         int res = 0;
  61         size_t delim_len = 0;
  62
  63         if (delim)
  64                 delim_len = strlen(delim);
  65
  66         res = stringbuilder_cpy(&str, &str_sz,
  67                         *(strings++), 0);
  68         while(--n_strings && !res) {
  69                 res = stringbuilder_cpy(&str, &str_sz,
  70                                 delim, delim_len);
  71                 if (!res)
  72                         res = stringbuilder_cpy(&str, &str_sz,
  73                                         *(strings++), 0);
  74         }
  75         return res;
  76
  77 }