1 #include <stdio.h> 2 #include <stdlib.h> 3 4 #define INIT_SIZE 10 5 #define GROWTH_FACTOR .5 6 7 char *read_line(void); 8 char *fread_line(FILE *); 9 10 int main (void) 11 { 12 char *str = NULL; 13 14 str = fread_line(stdin); 15 printf("%s", str); 16 17 free(str); 18 return 0; 19 } 20 21 char *read_line(void) 22 { 23 char *dst; 24 int aux; 25 size_t i, alloc_size; 26 27 alloc_size = INIT_SIZE; 28 29 if(!(dst = (char *)calloc(alloc_size, sizeof(char)))) return NULL; 30 31 for(i = 0; (aux = fgetc(stdin)) != EOF; i++) 32 { 33 if(i == (alloc_size - 2)) 34 { 35 alloc_size += (alloc_size * GROWTH_FACTOR); 36 if(!(dst = (char *)realloc(dst, alloc_size * sizeof(char)))) return NULL; 37 for(size_t j = i; j < alloc_size; j++) dst[j] = '\0'; 38 } 39 dst[i] = aux; 40 } 41 return dst; 42 } 43 44 char *fread_line(FILE *fp) 45 { 46 char *dst; 47 int aux; 48 size_t i, alloc_size; 49 50 if(!fp) return NULL; 51 52 alloc_size = INIT_SIZE; 53 54 if(!(dst = (char *)calloc(alloc_size, sizeof(char)))) return NULL; 55 56 for(i = 0; (aux = fgetc(fp)) != EOF; i++) 57 { 58 if(i == (alloc_size - 2)) 59 { 60 alloc_size += (alloc_size * GROWTH_FACTOR); 61 if(!(dst = (char *)realloc(dst, alloc_size * sizeof(char)))) return NULL; 62 for(size_t j = i; j < alloc_size; j++) dst[j] = '\0'; 63 } 64 dst[i] = aux; 65 } 66 return dst; 67 }
