112 lines
1.7 KiB
C
112 lines
1.7 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <ctype.h>
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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 <unistd.h>
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#include "text.h"
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#include "util.h"
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static void fold(FILE *, long);
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static void foldline(const char *, long);
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static bool bflag = false;
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static bool sflag = false;
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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 width] [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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long width = 80;
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FILE *fp;
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ARGBEGIN {
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case 'b':
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bflag = true;
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break;
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case 's':
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sflag = true;
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break;
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case 'w':
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width = estrtol(EARGF(usage()), 0);
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break;
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ARGNUM:
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width = ARGNUMF(0);
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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 == 0) {
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fold(stdin, width);
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} else {
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for(; argc > 0; argc--, argv++) {
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if(!(fp = fopen(argv[0], "r"))) {
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weprintf("fopen %s:", argv[0]);
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continue;
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}
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fold(fp, width);
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fclose(fp);
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}
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}
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return EXIT_SUCCESS;
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}
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static void
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fold(FILE *fp, long width)
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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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foldline(buf, width);
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free(buf);
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}
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static void
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foldline(const char *str, long width)
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{
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bool space;
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long col, j;
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size_t i = 0, n = 0;
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do {
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space = false;
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for(j = i, col = 0; str[j] && col <= width; j++) {
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if(!UTF8_POINT(str[j]) && !bflag)
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continue;
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if(sflag && isspace(str[j])) {
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space = true;
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n = j+1;
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}
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else if(!space)
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n = j;
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if(!bflag && iscntrl(str[j]))
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switch(str[j]) {
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case '\b':
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col--;
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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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if(fwrite(&str[i], 1, n-i, stdout) != n-i)
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eprintf("<stdout>: write error:");
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if(str[n])
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putchar('\n');
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} while(str[i = n] && str[i] != '\n');
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}
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