1 #include <stdio.h> 2 #include <stdlib.h> 3 4 #define INIT_SIZE 10 5 #define GROWTH_FACTOR .5 6 7 typedef enum { 8 OK, 9 ERROR_ALLOC_MEMORY, 10 ERROR_NULL_POINTER 11 } status_t; 12 13 status_t fread_line(FILE *, char **); 14 15 int main (void) 16 { 17 char *str; 18 19 fread_line(stdin, &str); 20 printf("%s", str); 21 22 free(str); 23 return 0; 24 } 25 26 status_t fread_line(FILE *fp, char **dst) 27 { 28 int aux; 29 size_t i, alloc_size; 30 31 if(!dst || !fp) return ERROR_NULL_POINTER; 32 33 alloc_size = INIT_SIZE; 34 35 if(!(*dst = (char *)calloc(alloc_size, sizeof(char)))) return ERROR_ALLOC_MEMORY; 36 37 for(i = 0; (aux = fgetc(fp)) != EOF; i++) 38 { 39 if(i == (alloc_size - 2)) 40 { 41 alloc_size += (alloc_size * GROWTH_FACTOR); 42 if(!(*dst = (char *)realloc(*dst, alloc_size * sizeof(char)))) return ERROR_ALLOC_MEMORY; 43 /* Fills the new memory with zeros to avoid valgrind uninitialized warning */ 44 for(size_t j = i; j < alloc_size; j++) (*dst)[j] = '\0'; 45 } 46 (*dst)[i] = aux; 47 } 48 return OK; 49 }
