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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int ft_strlen(const char *src) {
  5.     int i = 0;
  6.     while (src[i]) i++;
  7.     return i;
  8. }
  9.  
  10. char *ft_concat_params(int argc, char **argv) {
  11.  
  12.     // Conta o tamanho das strings.
  13.     int count = 1; // 1 = espaço do terminador nulo.
  14.     for (int i = 0; i < argc; i++) {
  15.         count += ft_strlen(argv[i]);
  16.     }
  17.  
  18.     // Cria a nova string que será retornada.
  19.     char *newString = (char *) malloc(count);
  20.  
  21.     // Copia as strings para o newString.
  22.     // Usa aux para percorrer o espaço de memória de newString.
  23.     char *aux = newString;
  24.     for (int i = 0; i < argc; i++) {
  25.         for (int j = 0; argv[i][j]; j++, aux++) {
  26.             aux[0] = argv[i][j];
  27.         }
  28.     }
  29.  
  30.     // Adiciona o terminador nulo.
  31.     aux[0] = 0;
  32.  
  33.     // Terminamos.
  34.     return newString;
  35. }
  36.  
  37. int main(void) {
  38.     const char *strings1[] = {"banana", "pera", "uva"};
  39.     char *a = ft_concat_params(3, strings1);
  40.     printf("[%s] - %d\n", a, ft_strlen(a));
  41.     free(a);
  42.  
  43.     const char *strings2[] = {"", "teste", "", "mais", "", "perigoso", ""};
  44.     char *b = ft_concat_params(7, strings2);
  45.     printf("[%s] - %d\n", b, ft_strlen(b));
  46.     free(b);
  47.  
  48.     const char *strings3[] = {"", "", ""};
  49.     char *c = ft_concat_params(3, strings3);
  50.     printf("[%s] - %d\n", c, ft_strlen(c));
  51.     free(c);
  52.  
  53.     const char *strings4[] = {};
  54.     char *d = ft_concat_params(0, strings4);
  55.     printf("[%s] - %d\n", d, ft_strlen(d));
  56.     free(d);
  57.  
  58.     return 0;
  59. }
  60.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin 
Standard input is empty
stdout 
[bananaperauva] - 13
[testemaisperigoso] - 17
[] - 0
[] - 0
https://ideone.com/Zq79Vk
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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