Word wrap function

Submitted by:J Kamy81

Date added:17 July, 2018

Category:C

This function takes a string and an output buffer and a desired width.

Tags: function , word wrap

Code Snippet:

/*
This function takes a string and an output buffer and a desired width. It then copies
the string to the buffer, inserting a new line character when a certain line
length is reached. If the end of the line is in the middle of a word, it will
backtrack along the string until white space is found.
*/

#include <string.h>
#include <ctype.h>

char* word_wrap (char* buffer, char* string, int line_width) {
int i = 0;
int k, counter;

while(i < strlen( string ) )
{
// copy string until the end of the line is reached
for ( counter = 1; counter <= line_width; counter++ )
{
// check if end of string reached
if ( i == strlen( string ) )
{
buffer[ i ] = 0;
return buffer;
}
buffer[ i ] = string[ i ];
// check for newlines embedded in the original input
// and reset the index
if ( buffer[ i ] == '\n' )
{
counter = 1;
}
i++;
}
// check for whitespace
if ( isspace( string[ i ] ) )
{
buffer[i] = '\n';
i++;
}
else
{
// check for nearest whitespace back in string
for ( k = i; k > 0; k--)
{
if ( isspace( string[ k ] ) )
{
buffer[ k ] = '\n';
// set string index back to character after this one
i = k + 1;
break;
}
}
}
}
buffer[ i ] = 0;

return buffer;
 
 

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