71 lines
1.1 KiB
C
71 lines
1.1 KiB
C
/* fold - folds long lines Author: Terrence W. Holm */
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/* Usage: fold [ -width ] [ file ... ] */
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#include <stdlib.h>
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#include <stdio.h>
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#define TAB 8
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#define DEFAULT_WIDTH 80
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int column = 0; /* Current column, retained between files */
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_PROTOTYPE(int main, (int argc, char **argv));
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_PROTOTYPE(void Fold, (FILE *f, int width));
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int main(argc, argv)
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int argc;
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char *argv[];
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{
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int width = DEFAULT_WIDTH;
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int i;
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FILE *f;
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if (argc > 1 && argv[1][0] == '-') {
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if ((width = atoi(&argv[1][1])) <= 0) {
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fprintf(stderr, "Bad number for fold\n");
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exit(1);
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}
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--argc;
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++argv;
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}
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if (argc == 1)
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Fold(stdin, width);
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else {
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for (i = 1; i < argc; ++i) {
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if ((f = fopen(argv[i], "r")) == NULL) {
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perror(argv[i]);
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exit(1);
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}
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Fold(f, width);
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fclose(f);
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}
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}
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return(0);
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}
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void Fold(f, width)
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FILE *f;
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int width;
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{
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int c;
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while ((c = getc(f)) != EOF) {
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if (c == '\t')
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column = (column / TAB + 1) * TAB;
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else if (c == '\b')
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column = column > 0 ? column - 1 : 0;
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else if (c == '\n' || c == '\r')
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column = 0;
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else
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++column;
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if (column > width) {
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putchar('\n');
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column = c == '\t' ? TAB : 1;
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}
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putchar(c);
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}
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}
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