[m-rev.] diff: pad_backslash.c

[Zoltan Somogyi]

util/pad_backslash.c:
	A program to help reformat C header files containing multi-line macro
	definitions. It is not installed or even by compiled by default, so
	it should have no impact on anyone, but will be available to
	developers.

Zoltan.

cvs diff: Diffing .
Index: mkinit.c
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/util/mkinit.c,v
retrieving revision 1.113
diff -u -b -r1.113 mkinit.c
--- mkinit.c	31 Jul 2006 03:13:53 -0000	1.113
+++ mkinit.c	10 Oct 2006 03:32:30 -0000
@@ -583,7 +583,6 @@
 int
 main(int argc, char **argv)
 {
-
     int exit_status;
     
     MR_progname = argv[0];
Index: pad_backslash.c
===================================================================
RCS file: pad_backslash.c
diff -N pad_backslash.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ pad_backslash.c	10 Oct 2006 04:03:09 -0000
@@ -0,0 +1,117 @@
+/*
+** vim: sw=4 ts=4 expandtab
+*/
+/*
+** Copyright (C) 2006 The University of Melbourne.
+** This file may only be copied under the terms of the GNU General
+** Public License - see the file COPYING in the Mercury distribution.
+*/
+
+/*
+** File: move_backslash.c
+** Author: zs
+**
+** Given an input stream in which some lines end with backslashes, pad those
+** lines with spaces so that the backslashes are in column 77.
+**
+*/
+
+/*---------------------------------------------------------------------------*/
+
+#include    <stdio.h>
+#include    <stdlib.h>
+#include    <unistd.h>
+
+/* options and arguments, set by parse_options() */
+static  int     target_column = 77;
+
+static  void    usage(void);
+static  void    process(FILE *fp);
+
+/*---------------------------------------------------------------------------*/
+
+int
+main(int argc, char **argv)
+{
+    int opt;
+    int num_files;
+
+    while ((opt = getopt(argc, argv, "c:")) != EOF) {
+        switch (opt) {
+
+            case 'c':
+                if (sscanf(optarg, "%d", &target_column) != 1) {
+                    usage();
+                }
+
+                break;
+
+        default:
+            usage();
+        }
+    }
+
+    num_files = argc - optind;
+    if (num_files == 0) {
+        process(stdin);
+    } else if (num_files == 1) {
+        FILE    *fp;
+
+        fp = fopen(argv[optind], "r");
+        if (fp != NULL) {
+            process(fp);
+            (void) fclose(fp);
+        } else {
+            perror(argv[0]);
+            exit(EXIT_FAILURE);
+        }
+    }
+
+    return EXIT_SUCCESS;
+}
+
+static void
+usage(void)
+{
+    fputs("Usage: pad_backslash [-c column] [inputfile]\n", stderr);
+    exit(EXIT_FAILURE);
+}
+
+static void
+process(FILE *fp)
+{
+    int cur_column;
+    int cur_char;
+    int next_char;
+
+    cur_column = 1;
+    while ((cur_char = getc(fp)) != EOF) {
+        if (cur_char == '\n') {
+            putchar(cur_char);
+            cur_column = 1;
+        } else if (cur_char == '\\') {
+            next_char = getc(fp);
+            if (next_char == '\n') {
+                while (cur_column < target_column) {
+                    putchar(' ');
+                    cur_column++;
+                }
+
+                putchar(cur_char);
+                putchar(next_char);
+                cur_column = 1;
+            } else {
+                putchar(cur_char);
+                cur_column++;
+            }
+        } else if (cur_char == '\t') {
+            while (cur_column % 8 != 0) {
+                putchar(' ');
+                cur_column++;
+            }
+        } else {
+            putchar(cur_char);
+            cur_column++;
+        }
+    }
+}
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