From 4b5bd45caa1ddd157e54197578b0b4f6a17d05bb Mon Sep 17 00:00:00 2001
From: Neil Stockbridge <neil@dist.ro>
Date: Wed, 18 May 2011 16:15:03 +1200
Subject: [PATCH] The source files are now under revision control

---
 Makefile     |   9 ++++
 src/Makefile |  34 +++++++++++++++
 src/main.c   | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 164 insertions(+)
 create mode 100644 Makefile
 create mode 100644 src/Makefile
 create mode 100644 src/main.c

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..505e758
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+
+#.SILENT:
+
+all:
+	$(MAKE) -C src/
+
+clean:
+	$(MAKE) -C src/ clean
+
diff --git a/src/Makefile b/src/Makefile
new file mode 100644
index 0000000..8f52ed5
--- /dev/null
+++ b/src/Makefile
@@ -0,0 +1,34 @@
+
+PROJECT = man
+#DEBUG = -g
+
+CC = gcc
+
+ifndef CFLAGS
+CFLAGS = -Os -Wall $(DEBUG) -DDEBUG
+endif
+
+ifndef STRIP
+STRIP=strip
+endif
+
+PARTS = main.o
+
+.c.o:
+	$(RM) $@
+#       $(CC) -MM $(CFLAGS) $*.c
+	$(CC) -c $(CFLAGS) $*.c
+
+.SILENT:
+
+# Targets...
+
+all: $(PROJECT)
+
+$(PROJECT): $(PARTS)
+	$(CC) $(LDFLAGS) $(LIBS) $(DEBUG) -o $(PROJECT) $(PARTS)
+	$(STRIP) $(PROJECT)
+
+clean:
+	rm -f *.o $(PROJECT)
+
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..feec08c
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,121 @@
+
+#include <stdio.h> // for fprintf
+#include <stdlib.h> // for getenv
+#include <unistd.h> // for access
+
+
+typedef  int  bool;
+#define  FALSE  0
+#define  TRUE   1
+
+#define  LENGTH_OF(a)  ( sizeof(a) / sizeof(a[0]) )
+
+
+#define  ANY_SECTION  0
+
+
+// This is for different forms that man page file names can take such as:
+//  + time.2
+//  + time.2.gz
+//
+typedef struct
+{
+  char  *name_template;
+  char  *emitter;
+}
+Form;
+
+
+int main( int argc, char **argv)
+{
+  // Parse the command-line
+  if ( argc < 2  ||  3 < argc)
+  {
+    fprintf( stderr, "Use: %s [section] page\n", argv[0]);
+    return 1;
+  }
+
+  int   section;
+  char  *page;
+
+  if ( 2 == argc)
+  {
+    page = argv[ 1];
+    section = ANY_SECTION;
+  }
+  else {
+    section = atoi( argv[1]);
+    page = argv[ 2];
+  }
+
+  // Parse the MANPATH
+  char  *man_path_s = getenv("MANPATH");
+  if ( ! man_path_s)
+    man_path_s = "/usr/share/man";
+  #define  MAX_MAN_PATH_ITEMS  32
+  char  *man_path_item[ MAX_MAN_PATH_ITEMS];
+  int   man_path_items = 0;
+  // Split the colon separated MANPATH in to discrete strings
+  char  *cursor = man_path_s;
+  bool  fresh_item = TRUE;
+  while( *cursor != '\0')
+  {
+    if ( fresh_item)
+    {
+      if ( man_path_items < MAX_MAN_PATH_ITEMS)
+        man_path_item[ man_path_items++] = cursor;
+      fresh_item = FALSE;
+    }
+    if ( ':' == *cursor)
+    {
+      *cursor = '\0';
+      fresh_item = TRUE;
+    }
+    cursor += 1;
+  }
+
+  // Go through every item on MANPATH
+  int  mpi;
+  for ( mpi = 0;  mpi < man_path_items;  ++ mpi)
+  {
+    char  *man_dir = man_path_item[ mpi];
+
+    // Go through sections 1..9 or just the specified section
+    int  min_s = ANY_SECTION == section ? 1 : section;
+    int  max_s = ANY_SECTION == section ? 9 : section;
+    int  s;
+    for ( s = min_s;  s <= max_s;  ++ s)
+    {
+      // If the named man page exists in this (MANPATH item, section) then
+      // display it
+      char  path_to_file[ 256];
+      Form  form[] = {
+        {"%s/man%i/%s.%i",    emitter:"cat"},
+        {"%s/man%i/%s.%i.gz", emitter:"zcat"},
+      };
+      char  cmd[ 512] = {'\0'};
+      int  i;
+      for ( i = 0;  i < LENGTH_OF(form);  ++ i)
+      {
+        Form  f = form[ i];
+
+        snprintf( path_to_file, sizeof(path_to_file), f.name_template, man_dir, s, page, s);
+        if ( ! access( path_to_file, R_OK))
+        {
+          snprintf( cmd, sizeof(cmd), "%s %s | mandoc | less", f.emitter, path_to_file);
+          break;
+        }
+      }
+
+      if ( cmd[0] != '\0')
+      {
+        system( cmd);
+        return 0;
+      }
+    }
+  }
+
+  fprintf( stderr, "No manual entry for %s\n", page);
+  return 1;
+}
+