ref: 0d4a3fdc1e339e5269a08d24bcba780e247ca327
dir: /tools/utils.c/
/* moonfish is licensed under the AGPL (v3 or later) */
/* copyright 2025 zamfofex */
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include "tools.h"
static void moonfish_fork(char **argv, int *in_fd, int *out_fd, char *directory)
{
int p1[2], p2[2];
int pid;
long int count, i;
if (pipe(p1) < 0) {
perror("pipe");
exit(1);
}
if (pipe(p2) < 0) {
perror("pipe");
exit(1);
}
pid = fork();
if (pid < 0) {
perror("fork");
exit(1);
}
if (pid != 0) {
*in_fd = p1[1];
*out_fd = p2[0];
close(p1[0]);
close(p2[1]);
return;
}
if (directory != NULL && chdir(directory)) {
perror("chdir");
exit(1);
}
if (dup2(p1[0], 0) != 0 || dup2(p2[1], 1) != 1 || dup2(p2[1], 2) != 2) {
perror("dup2");
exit(1);
}
count = sysconf(_SC_OPEN_MAX);
for (i = 3 ; i < count ; i++) close(i);
execvp(argv[0], argv);
perror("execvp");
exit(1);
}
void moonfish_spawn(char **argv, FILE **in, FILE **out, char *directory)
{
int in_fd, out_fd;
moonfish_fork(argv, &in_fd, &out_fd, directory);
*in = fdopen(in_fd, "w");
if (*in == NULL) {
perror("fdopen");
exit(1);
}
*out = fdopen(out_fd, "r");
if (*out == NULL) {
perror("fdopen");
exit(1);
}
errno = 0;
if (setvbuf(*in, NULL, _IOLBF, 0)) {
if (errno != 0) perror("setvbuf");
exit(1);
}
errno = 0;
if (setvbuf(*out, NULL, _IOLBF, 0)) {
if (errno != 0) perror("setvbuf");
exit(1);
}
}
char *moonfish_next(FILE *file)
{
static char line[2048];
if (fgets(line, sizeof line, file) == NULL) return NULL;
return line;
}
char *moonfish_wait(FILE *file, char *name)
{
char *line, *arg, *buffer;
for (;;) {
line = moonfish_next(file);
if (line == NULL) exit(1);
arg = strtok_r(line, "\r\n\t ", &buffer);
if (arg == NULL) continue;
if (!strcmp(line, name)) return strtok_r(NULL, "\r\n\t ", &buffer);
}
}
int moonfish_int(char *arg, int *result)
{
char *end;
long int long_result;
errno = 0;
long_result = strtol(arg, &end, 10);
if (errno || *end != 0) return 1;
if (long_result < INT_MIN) return 1;
if (long_result > INT_MAX) return 1;
*result = long_result;
return 0;
}
static void moonfish_usage_to(struct moonfish_arg *args, char *rest_format, char *argv0, FILE *out)
{
int i;
int col1, col2, n;
if (argv0 == NULL) argv0 = "<program>";
col1 = 0;
col2 = 0;
for (i = 0 ; args[i].letter != NULL || args[i].name != NULL ; i++) {
n = 0;
if (args[i].letter != NULL) {
n += 1 + strlen(args[i].letter);
if (args[i].format != NULL) n += strlen(args[i].format);
}
if (n > col1) col1 = n;
n = 0;
if (args[i].name != NULL) {
n += 2 + strlen(args[i].name);
if (args[i].format != NULL) n += 1 + strlen(args[i].format);
}
if (n > col2) col2 = n;
}
if (args[0].letter == NULL && args[0].name == NULL) fprintf(out, "usage: %s", argv0);
else fprintf(out, "usage: %s <options>...", argv0);
if (rest_format != NULL) fprintf(out, " [--] %s", rest_format);
fprintf(out, "\noptions:\n");
if (args[0].letter == NULL && args[0].name == NULL) return;
for (i = 0 ; args[i].letter != NULL || args[i].name != NULL ; i++) {
fprintf(out, " ");
n = 0;
if (args[i].letter != NULL) {
n += 1 + strlen(args[i].letter);
fprintf(out, "-%s", args[i].letter);
if (args[i].format != NULL) {
n += strlen(args[i].format);
fprintf(out, "\x1B[36m%s\x1B[0m", args[i].format);
}
}
if (args[i].letter != NULL && args[i].name != NULL) fprintf(out, ", ");
else fprintf(out, " ");
while (n < col1) {
fprintf(out, " ");
n++;
}
n = 0;
if (args[i].name != NULL) {
n += 2 + strlen(args[i].name);
fprintf(out, "--%s", args[i].name);
if (args[i].format != NULL) {
n += 1 + strlen(args[i].format);
fprintf(out, "=\x1B[36m%s\x1B[0m", args[i].format);
}
}
if (args[i].description != NULL) {
while (n < col2) {
fprintf(out, " ");
n++;
}
fprintf(out, " %s", args[i].description);
}
fprintf(out, "\n");
}
}
static int moonfish_letter_arg(struct moonfish_arg *args, char *arg, int *argc, char ***argv)
{
int i;
char *name;
size_t length;
for (i = 0 ; args[i].letter != NULL || args[i].name != NULL ; i++) {
name = args[i].letter;
if (name == NULL) continue;
length = strlen(name);
if (strncmp(arg, name, length)) continue;
if (args[i].format == NULL) {
arg += length;
if (arg[0] == 0) {
args[i].value = "";
return 0;
}
continue;
}
else {
args[i].value = arg + length;
if (arg[length] == '=') args[i].value = arg + length + 1;
if (arg[length] == 0) {
if (*argc <= 0) return 1;
(*argc)--;
(*argv)++;
args[i].value = (*argv)[0];
}
return 0;
}
}
return 1;
}
static int moonfish_name_arg(struct moonfish_arg *args, char *arg, int *argc, char ***argv)
{
int i;
char *name;
size_t length;
for (i = 0 ; args[i].letter != NULL || args[i].name != NULL ; i++) {
name = args[i].name;
if (name == NULL) continue;
length = strlen(name);
if (strncmp(arg, name, length)) continue;
if (args[i].format == NULL) {
if (arg[length] == 0) {
args[i].value = "";
return 0;
}
return 1;
}
else {
if (arg[length] == 0) {
if (*argc <= 0) return 1;
(*argc)--;
(*argv)++;
args[i].value = (*argv)[0];
return 0;
}
if (arg[length] == '=') {
args[i].value = arg + length + 1;
return 0;
}
}
}
return 1;
}
char **moonfish_args(struct moonfish_arg *args, char *rest_format, int argc, char **argv)
{
char *arg, *argv0;
if (argc <= 0) return argv;
argv0 = argv[0];
for (;;) {
argc--;
argv++;
if (argc <= 0) return argv;
arg = *argv;
if (!strcmp(arg, "-")) return argv;
if (!strcmp(arg, "--") && rest_format != NULL) return argv + 1;
if (!strcmp(arg, "--help") || !strcmp(arg, "-h") || !strcmp(arg, "-H")) {
moonfish_usage_to(args, rest_format, argv0, stdout);
exit(0);
}
if (arg[0] != '-') return argv;
arg++;
if (arg[0] == '-') {
arg++;
if (moonfish_name_arg(args, arg, &argc, &argv)) moonfish_usage(args, rest_format, argv0);
continue;
}
if (moonfish_letter_arg(args, arg, &argc, &argv)) moonfish_usage(args, rest_format, argv0);
}
}
void moonfish_usage(struct moonfish_arg *args, char *rest_format, char *argv0)
{
moonfish_usage_to(args, rest_format, argv0, stderr);
exit(1);
}