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/*
* $Id: sort.c,v 1.2 2002/02/16 19:53:16 darren Exp $
*
* Copyright (c) 1996-2001, Darren Hiebert
*
* This source code is released for free distribution under the terms of the
* GNU General Public License.
*
* This module contains functions to sort the tag entries.
*/
/*
* INCLUDE FILES
*/
#include "general.h" /* must always come first */
#if defined (HAVE_STDLIB_H)
# include <stdlib.h> /* to declare malloc () */
#endif
#include <string.h>
#include <stdio.h>
#include "debug.h"
#include "entry.h"
#include "options.h"
#include "read.h"
#include "routines.h"
#include "sort.h"
#ifdef TRAP_MEMORY_CALLS
# include "safe_malloc.h"
#endif
/*
* FUNCTION DEFINITIONS
*/
extern void catFile (const char *const name)
{
FILE *const fp = fopen (name, "r");
if (fp != NULL)
{
int c;
while ((c = getc (fp)) != EOF)
putchar (c);
fflush (stdout);
fclose (fp);
}
}
#ifdef EXTERNAL_SORT
#ifdef NON_CONST_PUTENV_PROTOTYPE
# define PE_CONST
#else
# define PE_CONST const
#endif
extern void externalSortTags (const boolean toStdout)
{
const char *const sortCommand = "sort -u -o";
PE_CONST char *const sortOrder1 = "LC_COLLATE=C";
PE_CONST char *const sortOrder2 = "LC_ALL=C";
const size_t length = 4 + strlen (sortOrder1) + strlen (sortOrder2) +
strlen (sortCommand) + (2 * strlen (tagFileName ()));
char *const cmd = (char *) malloc (length + 1);
int ret = -1;
if (cmd != NULL)
{
/* Ensure ASCII value sort order.
*/
#ifdef HAVE_SETENV
setenv ("LC_COLLATE", "C", 1);
setenv ("LC_ALL", "C", 1);
sprintf (cmd, "%s %s %s", sortCommand, tagFileName (), tagFileName ());
#else
# ifdef HAVE_PUTENV
putenv (sortOrder1);
putenv (sortOrder2);
sprintf (cmd, "%s %s %s", sortCommand, tagFileName (), tagFileName ());
# else
sprintf (cmd, "%s %s %s %s %s", sortOrder1, sortOrder2, sortCommand,
tagFileName (), tagFileName ());
# endif
#endif
verbose ("system (\"%s\")\n", cmd);
ret = system (cmd);
free (cmd);
}
if (ret != 0)
error (FATAL | PERROR, "cannot sort tag file");
else if (toStdout)
catFile (tagFileName ());
}
#else
/*
* These functions provide a basic internal sort. No great memory
* optimization is performed (e.g. recursive subdivided sorts),
* so have lots of memory if you have large tag files.
*/
static void failedSort (FILE *const fp, const char* msg)
{
const char* const cannotSort = "cannot sort tag file";
if (fp != NULL)
fclose (fp);
if (msg == NULL)
error (FATAL | PERROR, cannotSort);
else
error (FATAL, "%s: %s", msg, cannotSort);
}
static int compareTags (const void *const one, const void *const two)
{
const char *const line1 = *(const char* const*) one;
const char *const line2 = *(const char* const*) two;
return strcmp (line1, line2);
}
static void writeSortedTags (char **const table, const size_t numTags,
const boolean toStdout)
{
FILE *fp;
size_t i;
/* Write the sorted lines back into the tag file.
*/
if (toStdout)
fp = stdout;
else
{
fp = fopen (tagFileName (), "w");
if (fp == NULL)
failedSort (fp, NULL);
}
for (i = 0 ; i < numTags ; ++i)
{
/* Here we filter out identical tag *lines* (including search
* pattern) if this is not an xref file.
*/
if (i == 0 || Option.xref || strcmp (table [i], table [i-1]) != 0)
if (fputs (table [i], fp) == EOF)
failedSort (fp, NULL);
}
if (toStdout)
fflush (fp);
else
fclose (fp);
}
extern void internalSortTags (const boolean toStdout)
{
vString *vLine = vStringNew ();
FILE *fp = NULL;
const char *line;
size_t i;
/* Allocate a table of line pointers to be sorted.
*/
size_t numTags = TagFile.numTags.added + TagFile.numTags.prev;
const size_t tableSize = numTags * sizeof (char *);
char **const table = (char **) malloc (tableSize); /* line pointers */
DebugStatement ( size_t mallocSize = tableSize; ) /* cumulative total */
if (table == NULL)
failedSort (fp, "out of memory");
/* Open the tag file and place its lines into allocated buffers.
*/
fp = fopen (tagFileName (), "r");
if (fp == NULL)
failedSort (fp, NULL);
for (i = 0 ; i < numTags && ! feof (fp) ; )
{
line = readLine (vLine, fp);
if (line == NULL)
{
if (! feof (fp))
failedSort (fp, NULL);
break;
}
else if (*line == '\0' || strcmp (line, "\n") == 0)
; /* ignore blank lines */
else
{
const size_t stringSize = strlen (line) + 1;
table [i] = (char *) malloc (stringSize);
if (table [i] == NULL)
failedSort (fp, "out of memory");
DebugStatement ( mallocSize += stringSize; )
strcpy (table [i], line);
++i;
}
}
numTags = i;
fclose (fp);
vStringDelete (vLine);
/* Sort the lines.
*/
qsort (table, numTags, sizeof (*table), compareTags);
writeSortedTags (table, numTags, toStdout);
PrintStatus (("sort memory: %ld bytes\n", (long) mallocSize));
for (i = 0 ; i < numTags ; ++i)
free (table [i]);
free (table);
}
#endif
/* vi:set tabstop=8 shiftwidth=4: */
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