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  1. /*
  2. http://stackoverflow.com/questions/30388085/how-to-use-utf-8-in-c-code/30395420
  3.  
  4. sudo apt-get install libunistring0 libunistring-dev
  5. gcc utf8test.c -iunistring
  6. */
  7.  
  8. #include <stdio.h>
  9. #include <stdlib.h>
  10. #include <string.h>
  11. #include <unistr.h>
  12. #include <assert.h>
  13.  
  14. #define SIZE 40
  15.  
  16. int main(int argc, char **argv)
  17. {
  18.   uint8_t buf[SIZE + 1];
  19.   uint8_t *pat = "привет мир";
  20.   uint8_t str[SIZE + 2];
  21.  
  22.   /* Make sure program is correctly saved as UTF-8 */
  23.   assert(u8_strcmp("вход", "\320\262\321\205\320\276\320\264") == 0);
  24.   assert(u8_strcmp("выход", "\320\262\321\213\321\205\320\276\320\264") == 0);
  25.  
  26.   FILE *f1 = fopen("вход", "r");
  27.   FILE *f2 = fopen("выход", "w");
  28.  
  29.   if (f1 == 0 || f2 == 0)
  30.     {
  31.       perror("Failed to open one or both files");  /* use perror() */
  32.       return(1);
  33.     }
  34.  
  35.   size_t nbytes;
  36.   if ((nbytes = fread(buf, 1, SIZE, f1) > 0)
  37.     {
  38.       size_t nchars = u8_strlen(buf);
  39.  
  40.       if (u8_strncmp(buf, pat, nbytes) == 0)
  41.         {
  42.           sprintf(str, "%*s\n", 1+(int)nchars, buf);  /* nchars+1 length specifier for pad */
  43.           fwrite(str, 1, 1+nbytes, f2); /* +1 here too */
  44.         }
  45.       else {
  46.         fprintf(stderr, "%s: %s and %s differ\n", argv[0], buf, pat);
  47.         exit(1);
  48.       }
  49.     }
  50.   else {
  51.     perror("fread");
  52.   }
  53.  
  54.   fclose(f1);
  55.   fclose(f2);
  56.  
  57.   return(0);
  58. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.c:4:20: fatal error: unistr.h: No such file or directory
 #include <unistr.h>
                    ^
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/p0VfXq
http://stackoverflow.com/questions/30388085/how-to-use-utf-8-in-c-code/30395420
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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