differential diff tools

1 files changed, 91 insertions, 0 deletions

diff --git a/adiff.c b/adiff.c
new file mode 100644
index 0000000..d371633
--- /dev/null
+++ b/adiff.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * author: Jerome Glisse
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char *argv[])
+{
+    char line[256], tmp[256];
+    FILE **files;
+    unsigned i;
+
+    if (argc <= 2) {
+        fprintf(stderr, "%s FILES - FILES\n", argv[0]);
+        return -EINVAL;
+    }
+
+    files = malloc(sizeof(void*) * argc);
+    if (files == NULL) {
+        return -ENOMEM;
+    }
+
+    for (i = 1; i < argc; i++) {
+        if (!strcmp(argv[i], "-")) {
+            files[i] = NULL;
+            continue;
+        }
+        files[i] = fopen(argv[i], "r");
+        if (files[i] == NULL) {
+            fprintf(stderr, "failed opening %s\n", argv[i]);
+            return -EINVAL;
+        }
+    }
+
+    do {
+        unsigned diff, skip;
+
+        fgets(line, 256, files[1]);
+        for (i = 2, diff = 0, skip = 0; i < argc; i++) {
+            if (files[i] == NULL) {
+                diff = 1;
+                continue;
+            }
+            if (feof(files[i])) {
+                return 0;
+            }
+            fgets(tmp, 256, files[i]);
+            if (skip) {
+                continue;
+            }
+            if (diff) {
+                if (strcmp(line, tmp)) {
+                    printf("- %s", line);
+                    printf("+ %s", tmp);
+                }
+            } else {
+                if (strcmp(line, tmp)) {
+                    skip = 1;
+                }
+            }
+        }
+    } while (!feof(files[1]));
+
+    return 0;
+}