Merge branch 'strcmp'
This commit is contained in:
commit
e90d25e30f
|
@ -4,7 +4,7 @@
|
||||||
.\" This work is licensed under CC BY-SA 4.0. To see a copy of this license,
|
.\" This work is licensed under CC BY-SA 4.0. To see a copy of this license,
|
||||||
.\" visit <http://creativecommons.org/licenses/by-sa/4.0/>.
|
.\" visit <http://creativecommons.org/licenses/by-sa/4.0/>.
|
||||||
.\"
|
.\"
|
||||||
.TH STRCMP 1 2024-06-17 "Harakit X.X.X"
|
.TH STRCMP 1 2024-07-15 "Harakit X.X.X"
|
||||||
.SH NAME
|
.SH NAME
|
||||||
strcmp \(en compare strings
|
strcmp \(en compare strings
|
||||||
.\"
|
.\"
|
||||||
|
@ -20,15 +20,15 @@ Check whether string arguments are the same.
|
||||||
.SH DIAGNOSTICS
|
.SH DIAGNOSTICS
|
||||||
|
|
||||||
The program will exit successfully if the strings are identical. Otherwise, it
|
The program will exit successfully if the strings are identical. Otherwise, it
|
||||||
will exit with an error code of 1 if a string passed has a lesser byte value
|
will exit with an error code less than 128 if a string passed has a lesser byte
|
||||||
than one of the prior strings:
|
value than one of the prior strings:
|
||||||
|
|
||||||
.RS
|
.RS
|
||||||
strcmp b a
|
strcmp b a
|
||||||
.RE
|
.RE
|
||||||
|
|
||||||
or with an error code of 255 if it has a greater byte value than one of the
|
or with an error code greater than 128 if it has a greater byte value than one
|
||||||
prior strings:
|
of the prior strings:
|
||||||
|
|
||||||
.RS
|
.RS
|
||||||
strcmp a b
|
strcmp a b
|
||||||
|
|
47
src/strcmp.c
47
src/strcmp.c
|
@ -1,24 +1,43 @@
|
||||||
#include <stdio.h> /* fprintf(3), stderr */
|
/*
|
||||||
#include <stdlib.h> /* EXIT_FAILURE */
|
* Copyright (c) 2022–2024 DTB <trinity@trinity.moe>
|
||||||
#include <sysexits.h>
|
* SPDX-License-Identifier: AGPL-3.0-or-later
|
||||||
|
*
|
||||||
|
* This program is free software: you can redistribute it and/or modify it under
|
||||||
|
* the terms of the GNU Affero General Public License as published by the Free
|
||||||
|
* Software Foundation, either version 3 of the License, or (at your option) any
|
||||||
|
* later version.
|
||||||
|
*
|
||||||
|
* This program 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 Affero General Public License for more
|
||||||
|
* details.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the GNU Affero General Public License
|
||||||
|
* along with this program. If not, see https://www.gnu.org/licenses/.
|
||||||
|
*/
|
||||||
|
|
||||||
static char *program_name = "strcmp";
|
#include <stdio.h> /* fprintf(3), stderr */
|
||||||
|
#include <stdlib.h> /* size_t */
|
||||||
|
#include <sysexits.h> /* EX_USAGE */
|
||||||
|
|
||||||
|
char *program_name = "strcmp";
|
||||||
|
|
||||||
int main(int argc, char *argv[]){
|
int main(int argc, char *argv[]){
|
||||||
int i;
|
if (argc < 3) {
|
||||||
|
|
||||||
if(argc < 3){
|
|
||||||
fprintf(stderr, "Usage: %s string string...\n",
|
fprintf(stderr, "Usage: %s string string...\n",
|
||||||
argv[0] == NULL ? program_name : argv[0]);
|
argv[0] == NULL ? program_name : argv[0]
|
||||||
|
);
|
||||||
return EX_USAGE;
|
return EX_USAGE;
|
||||||
}
|
}
|
||||||
|
|
||||||
for(; *argv[1] != '\0'; ++argv[1])
|
/* This compares the Nth character of arg[2] onward with argv[1]'s Nth
|
||||||
for(i = 2; i < argc; ++i)
|
* character, rather than comparing each arg with argv[1] sequentially. */
|
||||||
if(*argv[i-1] > *argv[i])
|
for (; *argv[1] != '\0'; ++argv[1]) { /* iterate chars in argv[1] */
|
||||||
return 1;
|
for (size_t i = 2; i < argc; ++argv[i], ++i) { /* iterate &argv[2] */
|
||||||
else if(*argv[i-1] < *argv[i]++)
|
/* this never overruns because of nul termination */
|
||||||
return -1; /* actually 255 */
|
if (*argv[i-1] != *argv[i]) { return *argv[i-1] - *argv[i]; }
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in New Issue
Block a user