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#define _XOPEN_SOURCE 700
#include <errno.h>
#include <limits.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
enum FLAGS {
FLAG_r = 1 << 0,
};
int flags;
int
alphacompare(const void *s1, const void *s2) {
int ret = strcoll(*(const char **) s1, *(const char **) s2);
if (flags & FLAG_r)
ret *= -1;
return ret;
}
void
free_lines(char **lines, int n) {
for (int i = 0; i < n; i++)
free(lines[i]);
free(lines);
}
int
sort(FILE *f) {
char **lines = malloc(sizeof(char *));
if (lines == NULL) {
fprintf(stderr, "sort: %s\n", strerror(errno));
return 1;
}
size_t lsize = sizeof(char *);
size_t lused = 0;
int i = 0;
char *buf = NULL;
ssize_t bufused = 0;
size_t bufsize = 0;
while ((bufused = getline(&buf, &bufsize, f)) != -1) {
if (bufused + lused > lsize) {
char **tmp = realloc(lines, bufused + lused);
if (tmp == NULL) {
fprintf(stderr, "sort: %s\n", strerror(errno));
free_lines(lines, i);
free(buf);
return 1;
}
lused += bufused;
lines = tmp;
}
lines[i] = strndup(buf, bufused);
//strncpy(lines[i], buf, bufused);
lines[i][bufused] = '\0';
i++;
bufused = 0;
}
if (ferror(f)) {
fprintf(stderr, "sort: %s\n", strerror(errno));
free_lines(lines, i);
free(buf);
return 1;
}
qsort(lines, i, sizeof lines[0], alphacompare);
for (int j = 0; j < i; j++) {
printf("%s", lines[j]);
}
free_lines(lines, i);
free(buf);
return 0;
}
int
main(int argc, char **argv) {
setlocale(LC_ALL, "");
int c;
int ret = 0;
flags = 0;
while ((c = getopt(argc, argv, "r")) != -1) {
switch (c) {
case 'r':
flags |= FLAG_r;
break;
}
}
argc -= optind;
argv += optind - 1;
if (argc == 0)
return sort(stdin);
while (*++argv) {
FILE *f;
if (**argv == '-' && *(*argv + 1) == '\0')
f = stdin;
else {
f = fopen(*argv, "r");
if (f == NULL) {
fprintf(stderr, "sort: %s: %s\n", *argv, strerror(errno));
ret = 1;
continue;
}
}
if (sort(f) != 0)
ret = 1;
if (f != stdin && fclose(f) == EOF) {
fprintf(stderr, "sort: %s: %s\n", *argv, strerror(errno));
ret = 1;
continue;
}
}
return ret;
}
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