1 files changed, 94 insertions, 0 deletions
diff --git a/modified.c b/modified.c
new file mode 100644
index 0000000..81e8664
--- /dev/null
+++ b/modified.c
@@ -0,0 +1,94 @@
+#include "conf-update.h"
+
+bool user_modified(char *file) {
+	FILE *indexpipe, *filepipe;
+	char *line = NULL;
+	char *filedump = NULL;
+	size_t len = 0, len2 = 0;
+	char *md5sum;
+	char filemd5[MD5_DIGEST_LENGTH];
+	char hexdigest[32];
+	bool user_mod = TRUE;
+	if (access(MD5SUM_INDEX, R_OK) != 0) {
+		return TRUE;
+	} else {
+		indexpipe = fopen(MD5SUM_INDEX, "r");
+		exit_error(indexpipe, MD5SUM_INDEX);
+		while (getline(&line, &len, indexpipe) != -1) {
+			if (!strncmp(line, file, strlen(file)) && *(line + strlen(file)) == ' ') {
+				md5sum = strrchr(line, ' ') + 1;
+				filepipe = fopen(file, "r");
+				exit_error(filepipe, file);
+				if (getdelim(&filedump, &len2, EOF, filepipe) != -1) {
+					MD5(filedump, strlen(filedump), filemd5);
+					md52hex(filemd5, hexdigest);
+					if (!strncmp(md5sum, hexdigest, 32)) {
+						user_mod = FALSE;
+					}
+				}
+				fclose(filepipe);
+				free(filedump);
+			}
+		}
+		fclose(indexpipe);
+		free(line);
+		return user_mod;
+	}
+}
+
+void md52hex(char *md5sum, char *hexdigest) {
+	// this one is stolen from python's md5module.c
+	char c;
+	int i, j = 0;
+	
+	for(i=0; i<16; i++) {
+		c = (md5sum[i] >> 4) & 0xf;
+   		hexdigest[j] = (c>9) ? c+'a'-10 : c + '0';
+   		j++;
+		c = (md5sum[i] & 0xf);
+		hexdigest[j] = (c>9) ? c+'a'-10 : c + '0';
+		j++;
+    } 
+}
+
+void calc_md5(char *file, char* hexdigest) {
+	FILE *fp;
+	char *dump = NULL;
+	size_t len = 0;
+	
+	char md5sum[MD5_DIGEST_LENGTH];
+	
+	fp = fopen(file, "r");
+	if (getdelim(&dump, &len, EOF, fp) != -1) {
+		MD5(dump, strlen(dump), md5sum);
+		md52hex(md5sum, hexdigest);
+		free(dump);
+	}
+	fclose(fp);
+}
+
+void md5sum_update(char *file, char *hexdigest) {
+	FILE *oldpipe;
+	char *dump = NULL;
+	size_t len = 0;
+	char *entry;
+	oldpipe = fopen(MD5SUM_INDEX, "r");
+	exit_error(oldpipe, MD5SUM_INDEX);
+	
+	getdelim(&dump, &len, EOF, oldpipe);
+	if ((entry = strstr(dump, file))) {
+		entry = strchr(entry, '\n') - 32;
+		strncpy(entry, hexdigest, 32);
+		exit_error(freopen(MD5SUM_INDEX, "w", oldpipe), MD5SUM_INDEX);
+		exit_error(fwrite(dump, strlen(dump), sizeof(char), oldpipe), MD5SUM_INDEX);
+	} else {
+		// there's no entry at all yet
+		exit_error(freopen(MD5SUM_INDEX, "a", oldpipe), MD5SUM_INDEX);
+		exit_error(fwrite(file, strlen(file), sizeof(char), oldpipe), MD5SUM_INDEX);
+		exit_error(fwrite(" ", strlen(" "), sizeof(char), oldpipe), MD5SUM_INDEX);
+		exit_error(fwrite(hexdigest, 32, sizeof(char), oldpipe), MD5SUM_INDEX);
+		exit_error(fwrite("\n", strlen("\n"), sizeof(char), oldpipe), MD5SUM_INDEX);
+	}
+	free(dump);
+	fclose(oldpipe);
+}