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#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <math.h>
#include <string.h>
#include <unistd.h>
#include "ppm.h"
/* PPM and PGM utilities */
/* David Squire 980924 */
void add_comment(PPM *the_ppm, char *the_comment) {
char *original_comments = NULL, *c;
char *new_comment;
int i = 0, j;
if (the_comment[0] != '#') {
new_comment = (char *)malloc((strlen(the_comment) + 3)*sizeof(char));
new_comment[0] = '#';
new_comment[1] = ' ';
strcpy(&(new_comment[2]), the_comment);
}
else {
new_comment = (char *)malloc((strlen(the_comment) + 1)*sizeof(char));
strcpy(new_comment, the_comment);
}
if (the_ppm->comment_length != 0) {
original_comments = malloc(the_ppm->comment_length*sizeof(char));
c = the_ppm->comments;
while (*c != '\0')
original_comments[i++] = *c++;
original_comments[i] = '\0';
}
if (the_ppm->comments != NULL)
free(the_ppm->comments);
the_ppm->comment_length = i + strlen(new_comment);
the_ppm->comments = malloc(the_ppm->comment_length*sizeof(char));
i = 0;
if (original_comments != NULL) {
c = original_comments;
while (*c != '\0')
the_ppm->comments[i++] = *c++;
}
for (j = 0; j < strlen(new_comment); j++, i++)
the_ppm->comments[i] = new_comment[j];
the_ppm->comments[i] = '\0';
free(new_comment);
}
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