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/*
* No copyright is claimed. This code is in the public domain; do with
* it what you wish.
*
* Authors: Christian Goeschel Ndjomouo <cgoesc2@wgu.edu> [2025]
*/
#include <stdlib.h>
#include <sys/stat.h>
#include <errno.h>
#include "nls.h"
#include "strutils.h"
#include "pidutils.h"
/*
* ul_parse_pid_str() - Parse a string and store the found pid and/or pidfd inode.
*
* @pidstr: string in format `pid:pidfd_inode` that is to be parsed
* @pid_num: stores pid number
* @pfd_ino: stores pidfd inode number
*
* If @pfd_ino is not destined to be set, pass it as NULL.
*
* Return: On success, 0 is returned.
* On failure, a negative errno number is returned
* and errno is set to indicate the issue.
*/
int ul_parse_pid_str(char *pidstr, pid_t *pid_num, uint64_t *pfd_ino)
{
int rc;
char *end = NULL;
int64_t num = 0;
if (!pidstr || !*pidstr || !pid_num)
return -(errno = EINVAL);
num = strtoimax(pidstr, &end, 10);
if (num == 0 && end == pidstr)
return -(errno = EINVAL);
if (errno == ERANGE || (num <= 0 || num > SINT_MAX(pid_t)))
return -(errno = ERANGE);
*pid_num = (pid_t) num;
if (*end == ':' && pfd_ino) {
rc = ul_strtou64(++end, pfd_ino, 10);
if (rc < 0)
return rc;
if (*pfd_ino == 0)
return -(errno = ERANGE);
*end = '\0';
}
if (end && *end != '\0')
return -(errno = EINVAL);
return 0;
}
/*
* ul_parse_pid_str_or_err() - Parse a string and store the found pid
* and pidfd inode, or exit on error.
*
* @pidstr: string in format `pid[:pidfd_inode]` that is to be parsed
* @pid_num: stores pid number
* @pfd_ino: stores pidfd inode number
*
* If @pfd_ino is not destined to be set, pass it as NULL.
*
* On failure, err() is called with an error message to indicate the issue.
*/
void ul_parse_pid_str_or_err(char *pidstr, pid_t *pid_num, uint64_t *pfd_ino)
{
if (ul_parse_pid_str(pidstr, pid_num, pfd_ino) < 0) {
err(EXIT_FAILURE, N_("failed to parse PID argument '%s'"), pidstr);
}
}
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