Pool_21/search_replace1.c

/* Assignment name  : search_and_replace
Expected files   : search_and_replace.c
Allowed functions: write, exit
--------------------------------------------------------------------------------

Write a program called search_and_replace that takes 3 arguments, the first 
arguments is a string in which to replace a letter (2nd argument) by
another one (3rd argument).

If the number of arguments is not 3, just display a newline.

If the second argument is not contained in the first one (the string)
then the program simply rewrites the string followed by a newline.

Examples:
$>./search_and_replace "Papache est un sabre" "a" "o"
Popoche est un sobre
$>./search_and_replace "zaz" "art" "zul" | cat -e
$
$>./search_and_replace "zaz" "r" "u" | cat -e
zaz$
$>./search_and_replace "jacob" "a" "b" "c" "e" | cat -e
$
$>./search_and_replace "ZoZ eT Dovid oiME le METol." "o" "a" | cat -e
ZaZ eT David aiME le METal.$
$>./search_and_replace "wNcOre Un ExEmPle Pas Facilw a Ecrirw " "w" "e" | cat -e
eNcOre Un ExEmPle Pas Facile a Ecrire $ */

#include <unistd.h>

int	 main(int argc, char **argv)
{
	int	i;

	i = 0;
	if (argc == 4 && argv[2][1] == '\0' && argv[3][1] == '\0')
		while (argv[1][i])
		{
			if (argv[1][i] == argv[2][0])
			{
				argv[1][i] = argv[3][0];
			}
			else
			{
				argv[1][i] = argv[1][i];
			}
			write(1, &argv[1][i], 1);
			i++;
		}
	else
		write(1, "\n", 1);
	return (0);
}