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/* xcase - change uppercase characters to lowercase or vice versa. */
/* Copyright (C) 2008,2009,2023 Free Software Foundation, Inc.
This file is part of GNU Bash.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#ifndef errno
extern int errno;
#endif
extern int optind;
#define LOWER 1
#define UPPER 2
int
main(int ac, char **av)
{
int c, x;
int op;
FILE *inf;
op = 0;
while ((c = getopt(ac, av, "lnu")) != EOF) {
switch (c) {
case 'n':
setbuf (stdout, (char *)NULL);
break;
case 'u':
op = UPPER;
break;
case 'l':
op = LOWER;
break;
default:
fprintf(stderr, "casemod: usage: casemod [-lnu] [file]\n");
exit(2);
}
}
av += optind;
ac -= optind;
if (av[0] && (av[0][0] != '-' || av[0][1])) {
inf = fopen(av[0], "r");
if (inf == 0) {
fprintf(stderr, "casemod: %s: cannot open: %s\n", av[0], strerror(errno));
exit(1);
}
} else
inf = stdin;
while ((c = getc(inf)) != EOF) {
switch (op) {
case UPPER:
x = islower(c) ? toupper(c) : c;
break;
case LOWER:
x = isupper(c) ? tolower(c) : c;
break;
default:
x = c;
break;
}
putchar(x);
}
exit(0);
}
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