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sbase/sort.c

80 lines
1.7 KiB
C

/* See LICENSE file for copyright and license details. */
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "text.h"
#include "util.h"
static int linecmp(const char **, const char **);
static bool rflag = false;
static bool uflag = false;
struct linebuf {
char **lines;
long nlines;
long capacity;
};
#define EMPTY_LINEBUF {NULL, 0, 0,}
static struct linebuf linebuf = EMPTY_LINEBUF;
static void getlines(FILE *, struct linebuf *);
int
main(int argc, char *argv[])
{
char c;
long i;
FILE *fp;
while((c = getopt(argc, argv, "ru")) != -1)
switch(c) {
case 'r':
rflag = true;
break;
case 'u':
uflag = true;
break;
default:
exit(2);
}
if(optind == argc)
getlines(stdin, &linebuf);
else for(; optind < argc; optind++) {
if(!(fp = fopen(argv[optind], "r")))
eprintf("fopen %s:", argv[optind]);
getlines(fp, &linebuf);
fclose(fp);
}
qsort(linebuf.lines, linebuf.nlines, sizeof *linebuf.lines, (int (*)(const void *, const void *))linecmp);
for(i = 0; i < linebuf.nlines; i++)
if(!uflag || i == 0 || strcmp(linebuf.lines[i], linebuf.lines[i-1]) != 0)
fputs(linebuf.lines[i], stdout);
return EXIT_SUCCESS;
}
void
getlines(FILE *fp, struct linebuf *b)
{
char *line = NULL;
size_t size = 0;
while(afgets(&line, &size, fp)) {
if(++b->nlines > b->capacity && !(b->lines = realloc(b->lines, (b->capacity+=512) * sizeof *b->lines)))
eprintf("realloc:");
if(!(b->lines[b->nlines-1] = malloc(strlen(line)+1)))
eprintf("malloc:");
strcpy(b->lines[b->nlines-1], line);
}
free(line);
}
int
linecmp(const char **a, const char **b)
{
return strcmp(*a, *b) * (rflag ? -1 : +1);
}