CONVERTISSEUR DE FICHIERS VERS/DEPUIS UTF-8

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <glib/gconvert.h>

int main(int argc, char** argv) {
  FILE* f;
  char* t = NULL;
  int n = 0;
  gchar* b;
  if (argc != 3 || (strcmp(argv[1], "-l") != 0 && strcmp(argv[1], "-u") != 0)) {
    fprintf(stderr, "Usage: uconvert -l file\n");
    fprintf(stderr, "       uconvert -u file\n");
    return EXIT_FAILURE;
  }
  if ((f = fopen(argv[2], "rt")) == NULL) {
    fprintf(stderr, "Error opening file `%s` for reading.\n", argv[2]);
    return EXIT_FAILURE;
  }
  while (feof(f) == 0) {
    t = realloc(t, n + 1);
    t[n++] = fgetc(f);
  }
  fclose(f);
  if (t == NULL) {
    fprintf(stderr, "File `%s` is empty.\n", argv[2]);
    return EXIT_FAILURE;
  }
  t[n - 1] = '\0';
  fprintf(stderr, "Converting file `%s` ... ", argv[2]);
  if (strcmp(argv[1], "-u") == 0) {
    if ((b = g_locale_from_utf8(t, -1, NULL, NULL, NULL)) == NULL) {
      fprintf(stderr, "error\n");
      free(t);
      return EXIT_FAILURE;
    }
  } else {
    if ((b = g_locale_to_utf8(t, -1, NULL, NULL, NULL)) == NULL) {
      fprintf(stderr, "error\n");
      free(t);
      return EXIT_FAILURE;
    }
  }
  if ((f = fopen(argv[2], "wt")) == NULL) {
    fprintf(stderr, "error\n");
    free(b);
    free(t);
    return EXIT_FAILURE;
  }
  fprintf(f, "%s", b);
  fprintf(stderr, "done\n");
  free(b);
  free(t);
  return EXIT_SUCCESS;
}