I am having a rare problem with this program in C and a really don't get why I get a crash when I put long strings, I think that could be the function strtok but I really don't know why?
Here it is the main with minimal reproduced code tested by me:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
char **str_split(char *a_str, const char a_delim) {
char **result = 0;
size_t count = 0;
char *tmp = a_str;
char *last_comma = 0;
char delim[2];
delim[0] = a_delim;
delim[1] = 0;
/* Count how many elements will be extracted. */
while (*tmp) {
if (a_delim == *tmp) {
count++;
last_comma = tmp;
}
tmp++;
}
/* Add space for trailing token. */
count += last_comma < (a_str + strlen(a_str) - 1);
/* Add space for terminating null string so caller
knows where the list of returned strings ends. */
count++;
result = malloc(sizeof(char *) * count);
if (result) {
size_t idx = 0;
char *token = strtok(a_str, delim);
while (token) {
assert(idx < count);
*(result + idx++) = strdup(token);
token = strtok(0, delim);
}
assert(idx == count - 1);
*(result + idx) = 0;
}
return result;
}
char ***text_to_array(char *path) {
//Inputs T01/comprobar_senales/ctrlc_small.txt
char *palabra = path;
printf("%s", palabra);
FILE *fp = fopen(palabra, "r");
if (fp == NULL) {
perror("Unable to open file!");
exit(1);
}
//contador
int ch = 0;
int lines = 0;
while (!feof(fp)) {
ch = fgetc(fp);
if (ch == '\n') {
lines++;
}
}
lines++;
fclose(fp);
printf("numb of lines ");
printf("%d\n", lines);
//contador
fp = fopen(palabra, "r");
char chunk[255];//recordar mejor este lector
char ***list_with_text = malloc(lines * sizeof(char**));
//char list_with_text[lines];
// Store the chunks of text into a line buffer
int count_of_lines = 0;
size_t len = sizeof(chunk);
char *line = malloc(len);
char *aux_line = malloc(len);
char **aux_for_split;
if (line == NULL) {
perror("Unable to allocate memory for the line buffer.");
exit(1);
}
// "Empty" the string
line[0] = '\0';
while (fgets(chunk, sizeof(chunk), fp) != NULL) {
// Resize the line buffer if necessary
size_t len_used = strlen(line);
size_t chunk_used = strlen(chunk);
if (len - len_used < chunk_used) {
len *= 2;
if ((line = realloc(line, len)) == NULL) {
perror("Unable to reallocate memory for the line buffer.");
free(line);
exit(1);
}
}
// Copy the chunk to the end of the line buffer
strncpy(line + len_used, chunk, len - len_used);
len_used += chunk_used;
fputs(line, stdout);
strcpy(aux_line, line);
aux_for_split = str_split(aux_line, ' ');
list_with_text[count_of_lines] = aux_for_split; //char**
count_of_lines++;
// Check if line contains '\n', if yes process the line of text
if (line[len_used - 1] == '\n') {
printf("%d", strlen(line));
fputs("|*\n", stdout);
// "Empty" the line buffer
line[0] = '\0';
} else {
fputs(line, stdout);
}
}
fclose(fp);
free(line);
//printf(list_with_text);
printf("\nMax line size: %d\n", len);
return list_with_text;
}
char ***text_to_array(char *);
int main(int argc, char *argv[]) {
char ***texto_en_lista = text_to_array("input.txt");
printf("%s\n", texto_en_lista[0][0]);
printf("bye");
}
I have tried this input:
3
IchottMano 0 400 9 9 8 7 7 2 2 4 7 6 2 2 8 5 2 5 10 8 7 9 9 7 8 2 9 1 2 8 9 4 1 3 4 7 3 1 3 5 4 3 2 2 9 5 2 9 1 9 10 4 2 7 5 4 8 5 8 3 9 9 7 2 6 4 4 8 5 4 4 3 7 2 6 5
Jaluco 100 300 7 1 2 3 3 7 1 1 7 2 9 6 3 5 4 9 6 8 2 2 8 3 5 8 9 7 5 5 9 4 3 4 9 1 9 7 2 2 9 10 2 10 3 4 1 1 10 5 1 10 4 9 1 6 5 7 2 8 10 3 9 4 2 2 2 1 9 2 7 6 7 10 7 2 4 4 10 7 7 2 3 5 9 3 7 2 7 5 9 2 1 4 8 3 1 4 5 6 5 4 5 5 8 1 9 3 1 8 9 6 6 7 2 8
Mtenis96 200 500 7 9 5 9 2 4 3 8 10 9 2 3 9 7 2 4 8 7 1 1 7 4 3 9 9 6 5 7 10 2 10 7 5 3 2 6 10 10 4 5 4 7 8 3 2 6 10 10 1 4 2 2 2 6 9 2 4 8 5 2 10 9 3 9 8 7 3 2 1 4 2 4 7 8 4 6 9 4 3 9 4 5 2 1 1 2 6 6 4 3 7 4 7 3 4 5 6 5 4 5 5 8 1 9 3 1 8 9 6 6 7 2 8 1 2 3 4 1 2 3 4 1 2 3
and the only clue that I have is, that if I add one number (space and then a number) to the last line of this input the program crash, the execution didn't give me more information of the crash with the exception of this window:
