src/argparse.c - main - alexsm/syssoft2024

Репозиторий помещен в архив 11 сентября 2025. Вся функциональность доступна только для чтения.

src/argparse.c

88 строк2 KB

Alexander Smirnov

Fix execution params and implement proper buffer usage

08 янв 2025, 13:38

08 янв 2025, 13:388fe8359

#include <unistd.h>
#include <getopt.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>

#include "argparse.h"


enum OutputMode parseOutputMode(const char *modeName);


static const char helpMsgFmt[] = 
	"usage: %s " 
	"[-h (--help)] "
	"[-o (--ofile) <file>] "
	"[-m (--mode) <mode>] "
	"[ifile] "
	"\n"
	"\noptions:\n"
	"-h (--help): print this message\n"
	"-o (--ofile) <output-filename>: set output file (default: stdout)\n"
	"-m (--mode) <output-mode>: set output mode: `txt` or `gv` (default: txt)\n"
	"\npositional arguments:\n"
	"[ifile]: set input file (default: stdin)\n"
	"\n"
;


int initExecParams(struct ExecParams *eprmsPtr, int argc, char *const *argv) {
	eprmsPtr->ifilename = NULL;
	eprmsPtr->ofilename = NULL;
	eprmsPtr->omode = OM_TEXT;

	struct option longOptions[] = {
		{"help", no_argument, NULL, 'h'},
		{"ofile", required_argument, NULL, 'o'},
		{"mode", required_argument, NULL, 'm'},
		{0, 0, 0, 0}
	};

	int opt = 0;
	while ((opt = getopt_long(argc, argv, "o:m:h", longOptions, NULL)) != -1) {
		switch (opt) {
			case 'o':
				eprmsPtr->ofilename = optarg;
				break;
			case 'm':
				eprmsPtr->omode = parseOutputMode(optarg);
				if (eprmsPtr->omode == OM_UNKNOWN) {
					fputs("available output modes: txt gv\n", stderr);
					perror(optarg);
					return EXIT_FAILURE;
				}
				break;

			case 'h':
			case '?':
				fprintf(stderr, helpMsgFmt, argv[0]);
				return EXIT_FAILURE;

			case ':':
				fprintf(stderr, "\'%c\': no option argument given\n", optopt);
				return EXIT_FAILURE;

			default:
				fprintf(stderr, "\'%c\': unknown error\n", optopt);
				return EXIT_FAILURE;
		}
	}

	if (optind != argc)
		eprmsPtr->ifilename = argv[optind];

	return EXIT_SUCCESS;
}


enum OutputMode parseOutputMode(const char *modeName) {
	if (strcmp(modeName, "txt") == 0)
		return OM_TEXT;
	if (strcmp(modeName, "gv") == 0)
		return OM_GV;

	errno = EINVAL;
	return OM_UNKNOWN;
}