From a695cce70995bb092af1ccaf237e24913c674ec2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20A=2E=20Ortega?=
 <deathsbreed@themusicinnoise.net>
Date: Tue, 27 Dec 2016 21:31:24 +0100
Subject: [PATCH] Moving shit to files.c

---
 src/files.c | 13 +++++++++++++
 src/main.c  | 47 +++++++++++++++++++++++++----------------------
 2 files changed, 38 insertions(+), 22 deletions(-)

diff --git a/src/files.c b/src/files.c
index 0ef1e3a..3aed3aa 100644
--- a/src/files.c
+++ b/src/files.c
@@ -1,8 +1,13 @@
 #include "files.h"
 #include <stdio.h>
 #include <gmp.h>
+#include <assert.h>
 
 int inputPrimes(char *file, List *list) {
+	// Assert safeguards
+	assert(file != NULL);
+	assert(list != NULL);
+
 	FILE *pFile = fopen(file, "r");
 	if(pFile == NULL) return 1;
 	mpz_t n;
@@ -13,6 +18,10 @@ int inputPrimes(char *file, List *list) {
 }
 
 int outputPrimes(char *file, List *list) {
+	// Assert safeguards
+	assert(file != NULL);
+	assert(list != NULL);
+
 	FILE *oFile = fopen(file, "w");
 	if(oFile == NULL) return 1;
 	printf("Saving primes to `%s'...\n", file);
@@ -29,6 +38,10 @@ int outputPrimes(char *file, List *list) {
 }
 
 int exportPrimes(char *file, List *list, int base) {
+	// Assert safeguards
+	assert(file != NULL);
+	assert(list != NULL);
+
 	FILE *eFile = fopen(file, "w");
 	if(eFile == NULL) return 1;
 	printf("Exporting primes to `%s'...\n", file);
diff --git a/src/main.c b/src/main.c
index 7b61d7c..be5079c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -5,6 +5,8 @@
 #include <unistd.h>
 #include <gmp.h>
 
+#include <sys/stat.h>
+
 #include "list.h"
 #include "files.h"
 
@@ -21,13 +23,12 @@ int main(int argc, char *argv[]) {
 		 f_version = false,
 		 f_quiet = false;
 	int base = 10;
-	char *ofile = NULL;
-	char *ifile = NULL;
+	char *file = NULL;
 	char *efile = NULL;
 
 	// Parse commandline arguments
 	int c;
-	while((c = getopt(argc, argv, "hvqb:o:i:e:")) != -1) {
+	while((c = getopt(argc, argv, "hvqb:f:e:")) != -1) {
 		switch(c) {
 			case 'h':
 				f_help = true;
@@ -47,11 +48,8 @@ int main(int argc, char *argv[]) {
 					exit(1);
 				}
 				break;
-			case 'o':
-				ofile = optarg;
-				break;
-			case 'i':
-				ifile = optarg;
+			case 'f':
+				file = optarg;
 				break;
 			case 'e':
 				efile = optarg;
@@ -69,8 +67,7 @@ int main(int argc, char *argv[]) {
 		puts(" -v         print version number of program");
 		puts(" -q         quiet mode");
 		puts(" -b <base>  base in which to print primes between 2 and 62 (default 10)");
-		puts(" -o <file>  file to save primes to");
-		puts(" -i <file>  file to read primes from a previous session");
+		puts(" -f <file>  file in/from which primes are stored and read from in raw format");
 		puts(" -e <file>  export input file to plain text format");
 		return 0;
 	} else if(f_version) {
@@ -82,10 +79,15 @@ int main(int argc, char *argv[]) {
 	run = true;
 	signal(SIGINT, leave);
 
-	if(efile != NULL && ifile == NULL) {
+	if(efile != NULL && file == NULL) {
 		fprintf(stderr, "There must be an input file to export! Use `-h' for help.\n");
 		return 1;
 	}
+	bool newFile = true;
+	if(file != NULL) {
+		struct stat s;
+		if(stat(file, &s) == 0) newFile = false;
+	}
 
 	int exitCode = 0;
 
@@ -103,7 +105,7 @@ int main(int argc, char *argv[]) {
 
 	if(efile == NULL) puts("Use Ctrl+C to exit.");
 
-	if(ifile == NULL) {
+	if(newFile) {
 		// Add 2, a known prime to this list
 		mpz_set_ui(num, 2);
 		addToList(&primes, num);
@@ -118,15 +120,15 @@ int main(int argc, char *argv[]) {
 		mpz_add_ui(num, num, 1);
 	} else {
 		// Load primes from file
-		int err = inputPrimes(ifile, &primes);
+		int err = inputPrimes(file, &primes);
 
 		if(err == 0) {
 			printf("Loaded %zu primes.\n", primes.end);
 		} else {
 			if(err == 1)
-				fprintf(stderr, "Failed to open Indivisible file `%s'.\n", ifile);
+				fprintf(stderr, "Failed to open Indivisible file `%s'.\n", file);
 			else if(err == 2)
-				fprintf(stderr, "Failed to close Indivisible file `%s'.\n", ifile);
+				fprintf(stderr, "Failed to close Indivisible file `%s'.\n", file);
 			exitCode = 1;
 			goto releaseMemory;
 		}
@@ -181,28 +183,29 @@ nextPrime:
 
 	printf("Found %zu primes.\n", primes.end);
 
-	if(ofile != NULL) {
-		int err = outputPrimes(ofile, &primes);
+	if(file != NULL) {
+		int err = outputPrimes(file, &primes);
 		if(err == 0) {
 			puts("Successfully saved primes.");
 		} else {
 			if(err == 1)
-				fprintf(stderr, "Failed to open/create file `%s'.\n", ofile);
+				fprintf(stderr, "Failed to open/create file `%s'.\n", file);
 			else if(err == 2)
-				fprintf(stderr, "Failed to close file `%s'.\n", ofile);
+				fprintf(stderr, "Failed to close file `%s'.\n", file);
 			else if(err == 3)
-				fprintf(stderr, "Failed while writing a prime to `%s'.\n", ofile);
+				fprintf(stderr, "Failed while writing a prime to `%s'.\n", file);
 			exitCode = 1;
 			goto releaseMemory;
 		}
 
 	}
 
-releaseMemory:
-	puts("Clearing memory...");
 	// Clear GMP variables
 	mpz_clear(halfNum);
 	mpz_clear(num);
+
+releaseMemory:
+	puts("Clearing memory...");
 	// Deinitialize the list
 	deInitList(&primes);