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Merge branch 'strcmp'

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dtb 2024-07-15 19:52:26 -06:00
commit e90d25e30f
Signed by: trinity
GPG Key ID: 34C0543BBB6AF81B
2 changed files with 38 additions and 19 deletions
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10
docs/strcmp.1
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@ -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
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@ -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;
} }