Fold long input lines into two or more shorter lines after the last non-blank character - C String

C examples for String:String Function

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Description

Fold long input lines into two or more shorter lines after the last non-blank character

Demo Code

#include <stdio.h>

#define MAXLINE 1000/*from w  ww .j a  v a  2  s.c o  m*/
#define TAB_WIDTH 8
#define LINE_WIDTH 10

void fold(char s1[], char s2[], int linewidth, int tabwidth);

int main(void)
{
    char s1[MAXLINE] = "this is a test. this is a test. this is a test. this is a test. this is a test. this is a test. this is a test.";
    char s2[MAXLINE];

    fold(s1, s2, LINE_WIDTH, TAB_WIDTH);
    printf("\nfold result:\n%s\n", s2);

    return 0;
}

void fold(char s1[], char s2[], int lw, int tw){
    int i= 0, l= 0, c, k = -1, w  = 0;
    while ((c = s1[i]) != '\0') {
        if (c == ' ') {
            if (w + 1 == lw) {
                s2[l++] = '\n';
                w = 0;
                i = k;
            } else {
                s2[l++] = ' ';
                ++w;
            }
        } else if (c == '\t') {
            if (w + tw - w % tw >= lw) {
                s2[l++] = '\n';
                w = 0;
                i = k;
            } else {
                s2[l++] = '\t';
                w += tw;
            }
        } else {
            s2[l++] = c;
            if (w + 1 == lw) {
                s2[l++] = '\n';
                w = 0;
            } else {
                k = i;
                ++w;
            }
        }
        ++i;
    }
    s2[l++] = '\0';
}

Result


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