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/** \file util.c -- utility functions
* \copyright 2025 Matthias Andree, GNU GPL v2+
*/
#define _XOPEN_SOURCE 600
#include "util.h"
#include <string.h>
size_t str_split(char *str, const char *delim, char *outarray[], const size_t maxsplit, char **remainder)
{
char *saveptr = NULL;
char *startptr = str;
char *curptr = NULL;
size_t i;
for (i = 0; i < maxsplit; ++i) {
curptr = strtok_r(startptr, delim, &saveptr);
outarray[i] = curptr;
if (!curptr) break;
startptr = NULL; // null this for subsequent strtok_r calls, which will look at saveptr
}
if (maxsplit == i && remainder && curptr) {
*remainder = strtok_r(NULL, "", &saveptr);
}
return i;
}
bool str_startswith(const char *str /** string to check for \a prefix */,
const char *prefix /** prefix of string to check */)
{
return 0 == strncmp(str, prefix, strlen(prefix));
}
#if defined(TEST)
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include "xmalloc.h"
const char *program_name = "util";
static int test_split(int argc, char **argv) {
int rc = EXIT_SUCCESS;
for (int i = 0; i+2 < argc; i+=3) {
char *endptr = NULL;
errno = 0;
unsigned long maxsplit = strtoul(argv[i+2], &endptr, 0);
if (!maxsplit || ULONG_MAX == maxsplit || errno || *endptr || !*argv[i+2]) {
fprintf(stderr, "maxsplit invalid, skipping...\n");
rc = EXIT_FAILURE;
continue;
}
char **ary = (char **)xmalloc(sizeof(char *) * maxsplit);
char *remainder = 0;
size_t got = str_split(argv[i], argv[i+1], ary, maxsplit, &remainder);
printf("str_split(\"%s\", \"%s\", ARRAY, %zu) returned %zu, remainder \"%s\"\n",
argv[i], argv[i+1], maxsplit, got, remainder ? remainder : "(NULL)");
for (size_t j = 0; j < got; j++) printf(" %3zu %s\n", j, ary[j]);
xfree(ary);
}
return rc;
}
int main(int argc, char **argv) {
if (argc < 2) {
usage:
fprintf(stderr, "Usage: %s SPLIT string delim num [...]\n", argv[0]);
exit(EXIT_FAILURE);
}
if (!strcmp("SPLIT", argv[1])) return test_split(argc-2, argv+2); else goto usage;
}
#endif
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