a16f603b20
POSIX uniq(1) is required to write to its second argument, if one is given. The multiple-input feature I accidentally added might be useful, but users and scripts who rely on it would be put at risk for data loss if they ever run into a POSIX uniq(1).
98 lines
1.6 KiB
C
98 lines
1.6 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "text.h"
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#include "util.h"
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static void uniq_line(char *);
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static void uniq(FILE *, const char *);
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static void uniq_finish(void);
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static const char *countfmt = "";
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static bool dflag = false;
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static bool uflag = false;
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static char *prev_line = NULL;
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static long prev_line_count = 0;
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int
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main(int argc, char *argv[])
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{
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int c;
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FILE *fp;
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while((c = getopt(argc, argv, "cdu")) != -1)
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switch(c) {
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case 'c':
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countfmt = "%7ld ";
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break;
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case 'd':
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dflag = true;
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break;
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case 'u':
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uflag = true;
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break;
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default:
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exit(2);
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}
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if(optind == argc)
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uniq(stdin, "<stdin>");
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else if(optind == argc - 1) {
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if(!(fp = fopen(argv[optind], "r")))
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eprintf("fopen %s:", argv[optind]);
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uniq(fp, argv[optind]);
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fclose(fp);
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} else
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enprintf(2, "too many arguments\n");
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uniq_finish();
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return EXIT_SUCCESS;
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}
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void
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uniq_line(char *l)
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{
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bool lines_equal = ((l == NULL) || (prev_line == NULL))
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? l == prev_line
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: !strcmp(l, prev_line);
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if(lines_equal) {
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++prev_line_count;
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return;
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}
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if(prev_line != NULL) {
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if((prev_line_count == 1 && !dflag) ||
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(prev_line_count != 1 && !uflag)) {
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printf(countfmt, prev_line_count);
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fputs(prev_line, stdout);
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}
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free(prev_line);
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prev_line = NULL;
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}
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if(l && !(prev_line = strdup(l)))
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eprintf("strdup:");
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prev_line_count = 1;
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}
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void
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uniq(FILE *fp, const char *str)
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{
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char *buf = NULL;
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size_t size = 0;
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while(afgets(&buf, &size, fp))
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uniq_line(buf);
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}
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void
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uniq_finish()
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{
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uniq_line(NULL);
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}
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