117 lines
2.0 KiB
C
117 lines
2.0 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <ctype.h>
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#include <stdint.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 "util.h"
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static int bflag = 0;
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static int sflag = 0;
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static size_t width = 80;
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static void
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foldline(const char *str) {
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const char *p, *spacesect = NULL;
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size_t col, off;
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for (p = str, col = 0; *p && *p != '\n'; p++) {
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if (!UTF8_POINT(*p) && !bflag)
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continue;
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if (col >= width) {
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off = (sflag && spacesect) ? spacesect - str : p - str;
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if (fwrite(str, 1, off, stdout) != off)
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eprintf("fwrite <stdout>:");
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putchar('\n');
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spacesect = NULL;
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col = 0;
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p = str += off;
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}
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if (sflag && isspace(*p))
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spacesect = p + 1;
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if (!bflag && iscntrl(*p)) {
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switch(*p) {
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case '\b':
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col -= (col > 0);
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break;
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case '\r':
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col = 0;
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break;
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case '\t':
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col += (col + 1) % 8;
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break;
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}
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} else {
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col++;
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}
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}
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fputs(str, stdout);
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}
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static void
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fold(FILE *fp, const char *fname)
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{
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char *buf = NULL;
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size_t size = 0;
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while (getline(&buf, &size, fp) > 0)
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foldline(buf);
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if (ferror(fp))
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eprintf("getline %s:", fname);
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free(buf);
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}
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static void
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usage(void)
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{
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eprintf("usage: %s [-bs] [-w num | -num] [FILE ...]\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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FILE *fp;
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int ret = 0;
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ARGBEGIN {
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case 'b':
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bflag = 1;
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break;
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case 's':
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sflag = 1;
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break;
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case 'w':
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width = estrtonum(EARGF(usage()), 1, MIN(LLONG_MAX, SIZE_MAX));
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break;
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ARGNUM:
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if (!(width = ARGNUMF()))
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eprintf("illegal width value, too small\n");
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break;
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default:
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usage();
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} ARGEND;
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if (!argc) {
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fold(stdin, "<stdin>");
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} else {
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for (; *argv; argc--, argv++) {
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if (!strcmp(*argv, "-")) {
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*argv = "<stdin>";
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fp = stdin;
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} else if (!(fp = fopen(*argv, "r"))) {
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weprintf("fopen %s:", *argv);
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ret = 1;
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continue;
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}
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fold(fp, *argv);
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if (fp != stdin && fshut(fp, *argv))
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ret = 1;
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}
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}
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ret |= fshut(stdin, "<stdin>") | fshut(stdout, "<stdout>");
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return ret;
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}
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