utf8proc

A clean C library for processing UTF-8 Unicode data
git clone https://git.sinitax.com/juliastrings/utf8proc
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custom.c (993B)

      1#include "tests.h"
      2
      3static int thunk_test = 1;
      4
      5static utf8proc_int32_t custom(utf8proc_int32_t codepoint, void *thunk)
      6{
      7    check(((int *) thunk) == &thunk_test, "unexpected thunk passed");
      8    if (codepoint == 'a')
      9        return 'b';
     10    if (codepoint == 'S')
     11        return 0x00df; /* ß */
     12    return codepoint;
     13}
     14
     15int main(void)
     16{
     17    utf8proc_uint8_t input[] = {0x41,0x61,0x53,0x62,0xef,0xbd,0x81,0x00}; /* "AaSb\uff41" */
     18    utf8proc_uint8_t correct[] = {0x61,0x62,0x73,0x73,0x62,0x61,0x00}; /* "abssba" */
     19    utf8proc_uint8_t *output;
     20    utf8proc_map_custom(input, 0, &output, UTF8PROC_CASEFOLD | UTF8PROC_COMPOSE | UTF8PROC_COMPAT | UTF8PROC_NULLTERM,
     21                        custom, &thunk_test);
     22    printf("mapped \"%s\" -> \"%s\"\n", (char*)input, (char*)output);
     23    check(strlen((char*) output) == 6, "incorrect output length");
     24    check(!memcmp(correct, output, 7), "incorrect output data");
     25    free(output);
     26    printf("map_custom tests SUCCEEDED.\n");
     27    return 0;
     28}