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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. char *ft_strcpy(char *dst, const char *src) {
  5.     int i = -1;
  6.     do {
  7.         i++;
  8.         dst[i] = src[i];
  9.     } while (src[i]);
  10.     return dst;
  11. }
  12.  
  13. int ft_strlen(const char *src) {
  14.     int i = 0;
  15.     while (src[i]) i++;
  16.     return i;
  17. }
  18.  
  19. char *ft_concat_params(int argc, char **argv) {
  20.  
  21.     // Cache com os tamanhos das strings.
  22.     int *cache = (int *) malloc(argc * sizeof(int));
  23.  
  24.     // Conta o tamanho das strings.
  25.     int count = 1; // 1 = espaço do terminador nulo.
  26.     for (int i = 0; i < argc; i++) {
  27.         cache[i] = ft_strlen(argv[i]);
  28.         count += cache[i];
  29.     }
  30.  
  31.     // Cria a nova string que será retornada.
  32.     char *newString = (char *) malloc(count);
  33.  
  34.     // Copia as strings para o newString.
  35.     // Usa aux para percorrer o espaço de memória de newString.
  36.     char *aux = newString;
  37.     for (int i = 0; i < argc; i++) {
  38.         ft_strcpy(aux, argv[i]);
  39.         aux = &(aux[cache[i]]);
  40.     }
  41.  
  42.     // Adiciona o terminador nulo.
  43.     aux[0] = 0;
  44.  
  45.     // Não precisamos mais da cache.
  46.     free(cache);
  47.  
  48.     // Terminamos.
  49.     return newString;
  50. }
  51.  
  52. int main(void) {
  53.     const char *strings1[] = {"banana", "pera", "uva"};
  54.     char *a = ft_concat_params(3, strings1);
  55.     printf("[%s] - %d\n", a, ft_strlen(a));
  56.     free(a);
  57.  
  58.     const char *strings2[] = {"", "teste", "", "mais", "", "perigoso", ""};
  59.     char *b = ft_concat_params(7, strings2);
  60.     printf("[%s] - %d\n", b, ft_strlen(b));
  61.     free(b);
  62.  
  63.     const char *strings3[] = {"", "", ""};
  64.     char *c = ft_concat_params(3, strings3);
  65.     printf("[%s] - %d\n", c, ft_strlen(c));
  66.     free(c);
  67.  
  68.     const char *strings4[] = {};
  69.     char *d = ft_concat_params(0, strings4);
  70.     printf("[%s] - %d\n", d, ft_strlen(d));
  71.     free(d);
  72.  
  73.     return 0;
  74. }
  75.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
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Standard input is empty
stdout
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[bananaperauva] - 13
[testemaisperigoso] - 17
[] - 0
[] - 0
https://ideone.com/bE2aZT
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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