56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
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#include <stdio.h>
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#define MAXLINE 1000 /* maximum characters in a line */
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#define FOLDLENGTH 20 /* sub line size */
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int my_getline(char line[], int maxline);
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void fold(char input[], int maxline, int foldlength);
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int main()
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{
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int len; /* current line length */
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char line[MAXLINE]; /* current input line */
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while ((len = my_getline(line, MAXLINE)) > 0) {
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fold(line, MAXLINE, FOLDLENGTH);
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}
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return 0;
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}
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/* my_getline: reads in a line, return the length */
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int my_getline(char line[], int lim)
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{
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int c, i;
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for (i = 0; i < lim-1 && (c=getchar()) != EOF && c != '\n'; ++i)
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line[i] = c;
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if (c == '\n') {
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line[i] = c;
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++i;
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}
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line[i] = '\0';
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return i;
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}
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/* fold: split long input lines into 2 or more shorter lines after
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the last non-blank character that occurs before the nth
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column of input. */
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void fold(char input[], int lim, int fold_lim)
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{
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int i, j;
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char fold_line[lim];
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j = 0;
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for (i = 0; i < lim-1 && input[i] != '\0'; ++i, ++j) {
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if (j > fold_lim-1 && input[i] != ' ' && input[i] != '\t') {
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fold_line[j] = '\0';
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j = 0;
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printf("%s\n", fold_line);
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}
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fold_line[j] = input[i];
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}
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fold_line[j] = '\0';
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printf("%s\n", fold_line);
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}
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