commit 2389bd7bd472000ec0659789667fc0e4b2156680 Author: Amber Date: Sun Feb 21 21:23:42 2021 -0500 Initial commit. diff --git a/programming-assignment.c b/programming-assignment.c new file mode 100644 index 0000000..1501c8a --- /dev/null +++ b/programming-assignment.c @@ -0,0 +1,124 @@ +#include +#include +#include +#include +#include + +/************************************************************************** + * Authors: Gary Fleming, Amber McCloughan + * Class: CIS452 - Operating Systems Concepts + * Professor: Dr. Greg Wolffe + * Date: 4/19/2019 + * + * Program that mimics the ln command's basic functionality. + * You can create soft links or hard links using this program. + * + * Arguments + * ------------------------------------------------------------------------- + * -s : Specifies we're creating a soft link. + * [source] : Input a file that will be linked to. MUST COME + * FIRST! + * [destination] : Input a file name for the new link file. MUST + * COME LAST! + ***************************************************************************/ + +#define MAX_BUF_SIZE 102 + +/** + * Main function of the program. Takes in + * three possible arguments: -s, [source], + * and [destination]. + * + * @param argc, number of arguments. + * @param argv, the actual arguments. + */ +int main(int argc, char *argv[]) +{ + // Tracking if we're doing a symlink. + int sFlag = 0; + + // For counting arguments. + int numCount = 0; + + // Used in the for loop when checking arguments. + int i; + + // Buffer for link source. + char *source = malloc(MAX_BUF_SIZE * sizeof(char)); + + // Buffer for the new link. + char *dest = malloc(MAX_BUF_SIZE * sizeof(char)); + + // Reading the program arguments. + for (i = 1; i < argc; i++) + { + // If we found the -s flag. + if (!strcmp(argv[i], "-s")) + { + sFlag = 1; + } + // For file path arguments. + else + { + // For the source file. + if (numCount == 0) + { + strcpy(source, argv[i]); + numCount++; + } + // For the destination file (link). + else if (numCount == 1) + { + strcpy(dest, argv[i]); + numCount++; + } + // There must have been too many arguments. + else + { + printf("Too many arguments provided!\n"); + free(source); + free(dest); + return -1; + } + } + } + + // There must have not been enough arguments. + if (numCount < 2) + { + printf("Not enough arguments provided!\n"); + free(source); + free(dest); + return -1; + } + + // If we're dealing with a hard link. + if (sFlag == 0) + { + if (link(source, dest) < 0) + { + perror("Huh? There is... "); + free(source); + free(dest); + return -1; + } + } + // Otherwise, we're dealing with a soft link. + else + { + if (symlink(source, dest) < 0) + { + perror("Huh? There is... "); + free(source); + free(dest); + return -1; + } + } + + // Freeing resources. + free(source); + free(dest); + + // Goodbye (for the semester)! + return 0; +} \ No newline at end of file