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//
// Created by jhunk on 3/21/26.
//
#include "str.h"
int num_chars(const char *sptr, int ch) {
int result = 0;
for (int i = 0; sptr[i] != '\0'; i++) {
if (sptr[i] == ch) {
result++;
}
}
return result;
}
char** split(char *_sptr, const char* delim, size_t max, size_t *num)
{
// Zero the number of elements in the result
int have_num = num != NULL;
if (have_num) {
*num = 0;
}
if (_sptr == NULL || delim == NULL) {
return NULL;
}
size_t split_alloc = 0;
// Duplicate the input string and save a copy of the pointer to be freed later
char *orig = _sptr;
char *sptr = strdup(orig);
if (!sptr) {
return NULL;
}
// Determine how many delimiters are present
for (size_t i = 0; i < strlen(delim); i++) {
if (max && i > max) {
break;
}
split_alloc += num_chars(sptr, delim[i]);
}
// Preallocate enough records based on the number of delimiters
char **result = calloc(split_alloc + 2, sizeof(result[0]));
if (!result) {
free(sptr);
sptr = NULL;
return NULL;
}
// No delimiter, but the string was not NULL, so return the original string
if (split_alloc == 0) {
result[0] = sptr;
return result;
}
// Separate the string into individual parts and store them in the result array
char *token = NULL;
char *sptr_tmp = sptr;
size_t pos = 0;
size_t i;
for (i = 0; (token = strsep(&sptr_tmp, delim)) != NULL; i++) {
// When max is zero, record all tokens
if (max > 0 && i == max) {
// Maximum number of splits occurred.
// Record position in string
pos = token - sptr;
break;
}
result[i] = calloc(BUFSIZ, sizeof(char));
if (!result[i]) {
return NULL;
}
strcpy(result[i], token);
}
// pos is non-zero when maximum split is reached
if (pos) {
// append the remaining string contents to array
result[i] = calloc(BUFSIZ, sizeof(char));
if (!result[i]) {
return NULL;
}
strcpy(result[i], &orig[pos]);
i++;
}
if (have_num) {
// Count of elements in the array
*num = i;
}
free(sptr);
sptr = NULL;
return result;
}
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