54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
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/* common.c
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*
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* Created by Rory Healy (healyr@student.unimelb.edu.au)
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* Created on 25th August 2021
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* Last modified 25th August 2021
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*
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* Contains functions for general use throughout other files.
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*
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*/
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#ifndef COMMON_HEADER
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#include "common.h"
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#endif
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#define ARGC_CORRECT_LEN 4
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#define MEMORY_ALLOCATION_ERROR "Error: Cannot allocate memory.\n"
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#define OPEN_FILE_ERROR "Error: Unable to open file %s\n"
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#define NUM_FILE_ERROR "Error: Incorrect number of inputs (3 required).\n"
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/* Checks if a given pointer is null. Used for malloc() and realloc(). */
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void checkNullPointer(void *ptr) {
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if (!ptr) {
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fputs(MEMORY_ALLOCATION_ERROR, stderr);
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exit(EXIT_FAILURE);
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}
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}
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/* Checks the validity of the command line input arguments */
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void checkInputArgs(int argc, char **argv, FILE **datasetFile, \
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FILE **polygonFile, FILE **outputFile) {
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if (argc != ARGC_CORRECT_LEN) {
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fputs(NUM_FILE_ERROR, stderr);
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exit(EXIT_FAILURE);
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}
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*datasetFile = fopen(argv[1], "r");
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if (*datasetFile == NULL) {
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fprintf(stderr, OPEN_FILE_ERROR, argv[1]);
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exit(EXIT_FAILURE);
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}
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*polygonFile = fopen(argv[2], "r");
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if (*polygonFile == NULL) {
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fprintf(stderr, OPEN_FILE_ERROR, argv[2]);
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exit(EXIT_FAILURE);
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}
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*outputFile = fopen(argv[3], "w");
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if (*outputFile == NULL) {
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fprintf(stderr, OPEN_FILE_ERROR, argv[3]);
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exit(EXIT_FAILURE);
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}
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}
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