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image_filter.c
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image_filter.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "bitmap.h"
#define ERROR_MESSAGE "Warning: one or more filter had an error, so the output image may not be correct.\n"
#define SUCCESS_MESSAGE "Image transformed successfully!\n"
/*
* Check whether the given command is a valid image filter, and if so,
* run the process.
*
* We've given you this function to illustrate the expected command-line
* arguments for image_filter. No further error-checking is required for
* the child processes.
*/
void run_command(const char *cmd) {
if (strcmp(cmd, "copy") == 0 || strcmp(cmd, "./copy") == 0 ||
strcmp(cmd, "greyscale") == 0 || strcmp(cmd, "./greyscale") == 0 ||
strcmp(cmd, "gaussian_blur") == 0 || strcmp(cmd, "./gaussian_blur") == 0 ||
strcmp(cmd, "edge_detection") == 0 || strcmp(cmd, "./edge_detection") == 0) {
execl(cmd, cmd, NULL);
} else if (strncmp(cmd, "scale", 5) == 0) {
// Note: the numeric argument starts at cmd[6]
execl("scale", "scale", cmd + 6, NULL);
} else if (strncmp(cmd, "./scale", 7) == 0) {
// Note: the numeric argument starts at cmd[8]
execl("./scale", "./scale", cmd + 8, NULL);
} else {
fprintf(stderr, "Invalid command '%s'\n", cmd);
exit(1);
}
}
// TODO: Complete this function.
int main(int argc, char **argv) {
if (argc < 3) {
printf("Usage: image_filter input output [filter ...]\n");
exit(1);
}
printf(SUCCESS_MESSAGE);
return 0;
}