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/*
* UNG's Not GNU
*
* Copyright (c) 2020, Jakob Kaivo <jkk@ung.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define _XOPEN_SOURCE 700
#include <errno.h>
#include <limits.h>
#include <locale.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifndef LINE_MAX
#define LINE_MAX _POSIX_LINE_MAX
#endif
struct line {
FILE *file;
fpos_t pos;
};
static int sort_check(const char *input, char sep, const char *key, unsigned int flags)
{
(void)sep;
(void)key;
(void)flags;
char prev[LINE_MAX] = "";
char cur[LINE_MAX] = "";
uintmax_t line = 1;
FILE *in = stdin;
if (strcmp(input, "-")) {
in = fopen(input, "r");
}
if (in == NULL) {
fprintf(stderr, "sort: %s: %s\n", input, strerror(errno));
}
while (fgets(cur, sizeof(cur), in) != NULL) {
if (strcoll(cur, prev) < 0) {
fprintf(stderr, "sort: %s: disorder at line %ju\n",
input, line);
return 1;
}
strcpy(prev, cur);
line++;
}
fclose(in);
return 0;
}
static void sort_add_pos(struct line **lines, size_t *nlines, FILE *f)
{
struct line *tmp = realloc(*lines, (*nlines + 1) * sizeof(**lines));
if (tmp == NULL) {
perror("sort");
exit(1);
}
*lines = tmp;
(*lines)[*nlines].file = f;
fgetpos(f, &((*lines)[*nlines].pos));
}
static int sort_read(const char *path, struct line **lines, size_t *nlines)
{
FILE *f = stdin;
if (strcmp(path, "-")) {
f = fopen(path, "r");
}
if (f == NULL) {
fprintf(stderr, "sort: %s: %s\n", path, strerror(errno));
return 1;
}
char cur[LINE_MAX] = "";
sort_add_pos(lines, nlines, f);
while (fgets(cur, sizeof(cur), f) != NULL) {
}
/* ignore EOF position */
(*nlines)--;
/* do *NOT* close f */
return 0;
}
static int sort_compar(const void *a, const void *b)
{
const struct line *l1 = a;
const struct line *l2 = b;
char line1[LINE_MAX] = "";
char line2[LINE_MAX] = "";
fsetpos(l1->file, &l1->pos);
fgets(line1, sizeof(line1), l1->file);
fsetpos(l2->file, &l2->pos);
fgets(line2, sizeof(line2), l2->file);
return strcoll(line1, line2);
}
static int sort_sort(char *files[], int nfiles, char sep, const char *key, unsigned int flags)
{
(void)sep;
(void)key;
(void)flags;
struct line *lines = NULL;
size_t nlines = 0;
for (int i = 0; i < nfiles; i++) {
if (sort_read(files[i], &lines, &nlines) != 0) {
return 1;
}
}
qsort(lines, nlines, sizeof(*lines), sort_compar);
return 0;
}
int main(int argc, char *argv[])
{
setlocale(LC_ALL, "");
char *output = "-";
enum { SORT, MERGE, CHECK } mode = SORT;
char separator = '\0';
char *key = NULL;
unsigned int flags = 0;
/* TODO: handle + prefixed options */
int c;
while ((c = getopt(argc, argv, "mcCo:t:k:bdfinru")) != -1) {
switch (c) {
case 'm':
mode = MERGE;
break;
case 'C':
/* disable warning */
/* FALLTHROUGH */
case 'c':
mode = CHECK;
break;
case 'o':
output = optarg;
break;
case 't':
separator = *optarg;
break;
case 'k':
key = optarg;
break;
case 'b':
case 'd':
case 'f':
case 'i':
case 'n':
case 'r':
case 'u':
break;
default:
return 1;
}
}
if (mode == CHECK) {
return sort_check(argv[optind], separator, key, flags);
}
#if 0
if (mode == MERGE) {
/* optimize to assume sorted input */
return sort_merge(argv + optind, argc - optind, separator, key, flags);
}
#endif
return sort_sort(argv + optind, argc - optind, separator, key, flags);
}
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