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Eliminated use of PATH_MAX in order to ease porting

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Restructured infile/outfile code to eliminate need for access() function
and improve readability
Added file type check before reading config file. boxes used to generate
a weird error message if the config file is a directory
This commit is contained in:
Thomas Jensen 1999-09-10 19:21:05 +00:00
parent c4f5a6a04c
commit 532bd941b3
1 changed files with 106 additions and 51 deletions
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157
src/boxes.c
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@ -3,7 +3,7 @@
* Date created: March 18, 1999 (Thursday, 15:09h)
* Author: Copyright (C) 1999 Thomas Jensen
* tsjensen@stud.informatik.uni-erlangen.de
* Version: $Id: boxes.c,v 1.31 1999/08/21 23:33:03 tsjensen Exp tsjensen $
* Version: $Id: boxes.c,v 1.32 1999/08/22 11:34:46 tsjensen Exp tsjensen $
* Language: ANSI C
* Platforms: sunos5/sparc, for now
* World Wide Web: http://home.pages.de/~jensen/boxes/
@ -48,6 +48,9 @@
* Revision History:
*
* $Log: boxes.c,v $
* Revision 1.32 1999/08/22 11:34:46 tsjensen
* Bugfix: no-input-check must take place before indentation computation
*
* Revision 1.31 1999/08/21 23:33:03 tsjensen
* Added usage of system-wide config file (GLOBALCONF from boxes.h)
* Moved config file selection code into it own function (get_config_file())
@ -202,6 +205,8 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "shape.h"
#include "boxes.h"
@ -215,7 +220,9 @@ extern int optind, opterr, optopt; /* for getopt() */
static const char rcsid_boxes_c[] =
"$Id: boxes.c,v 1.31 1999/08/21 23:33:03 tsjensen Exp tsjensen $";
"$Id: boxes.c,v 1.32 1999/08/22 11:34:46 tsjensen Exp tsjensen $";
/* _\|/_
@ -270,6 +277,33 @@ static void usage (FILE *st)
static int is_dir (const char *path)
/*
* Return true if file specified by path is a directory
*
* path file name to check
*
* RETURNS: == 0 path is not a directory
* > 0 path is a directory
* == -1 error in stat() call
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*/
{
struct stat sinf;
int rc;
rc = stat (path, &sinf);
if (rc) {
perror (PROJECT);
return -1;
}
return (sinf.st_mode & S_IFMT) == S_IFDIR;
}
static int get_config_file()
/*
* Set yyin and yyfilename to the config file to be used.
@ -281,6 +315,8 @@ static int get_config_file()
* (3) system-wide config file from GLOBALCONF macro.
* If neither file exists, return complainingly.
*
* May change current working directory to $HOME.
*
* RETURNS: == 0 success (yyin and yyfilename are set)
* != 0 error (yyin is unmodified)
*
@ -289,6 +325,7 @@ static int get_config_file()
{
FILE *new_yyin = NULL;
char *s; /* points to data from environment */
int rc;
if (yyin != stdin)
return 0; /* we're already ok */
@ -304,6 +341,14 @@ static int get_config_file()
"for input (taken from $BOXES).\n", PROJECT, s);
return 1;
}
rc = is_dir (s);
if (rc == -1)
return 1;
else if (rc) {
fprintf (stderr, "%s: Alleged config file '%s' is a directory "
"(taken from $BOXES)\n", PROJECT, s);
return 1;
}
yyfilename = (char *) strdup (s);
if (yyfilename == NULL) {
perror (PROJECT);
@ -318,19 +363,31 @@ static int get_config_file()
*/
s = getenv ("HOME");
if (s) {
char buf[PATH_MAX]; /* to build file name */
strncpy (buf, s, PATH_MAX);
buf[PATH_MAX-1-7] = '\0'; /* ensure space for "/.boxes" */
strcat (buf, "/.boxes");
new_yyin = fopen (buf, "r");
rc = chdir (s);
if (rc) {
perror (PROJECT);
return 1;
}
new_yyin = fopen (".boxes", "r");
if (new_yyin) {
yyfilename = (char *) strdup (buf);
if (yyfilename == NULL) {
perror (PROJECT);
rc = is_dir (".boxes");
if (rc == -1)
return 1;
else {
if (rc == 0) {
yyfilename = (char *) strdup (".boxes");
if (yyfilename == NULL) {
perror (PROJECT);
return 1;
}
yyin = new_yyin;
return 0;
}
else {
fclose (new_yyin);
new_yyin = NULL;
}
}
yyin = new_yyin;
return 0;
}
}
else {
@ -343,6 +400,14 @@ static int get_config_file()
*/
new_yyin = fopen (GLOBALCONF, "r");
if (new_yyin) {
rc = is_dir (GLOBALCONF);
if (rc == -1)
return 1;
else if (rc) {
fprintf (stderr, "%s: Alleged system-wide config file '%s' "
"is a directory\n", PROJECT, GLOBALCONF);
return 1;
}
yyfilename = (char *) strdup (GLOBALCONF);
if (yyfilename == NULL) {
perror (PROJECT);
@ -380,7 +445,6 @@ static int process_commandline (int argc, char *argv[])
char *pdummy;
char c;
int errfl = 0; /* true on error */
int outfile_existed = 0; /* true if we overwrite a file */
size_t optlen;
int rc;
@ -495,6 +559,14 @@ static int process_commandline (int argc, char *argv[])
"for input.\n", PROJECT, optarg);
return 1;
}
rc = is_dir (optarg);
if (rc == -1)
return 1;
else if (rc) {
fprintf (stderr, "%s: Alleged config file '%s' is a "
"directory\n", PROJECT, optarg);
return 1;
}
yyfilename = (char *) strdup (optarg);
if (yyfilename == NULL) {
perror (PROJECT);
@ -687,34 +759,25 @@ static int process_commandline (int argc, char *argv[])
}
} while (oc != EOF);
/*
* If no config file has as yet been specified, try getting it elsewhere.
*/
rc = get_config_file(); /* sets yyin and yyfilename */
if (rc)
return rc;
/*
* Input and Output Files
*
* After any command line options, an input file and an output file may
* be specified (in that order). "-" may be substituted for standard
* input or output. A third file name would be invalid.
* The alogrithm is as follows:
*
* If no files are given, use stdin and stdout.
* Else If infile is "-", use stdin for input
* Else open specified file (die if it doesn't work)
* If no output file is given, use stdout for output
* Else If outfile is "-", use stdout for output
* Else open specified file for writing (die if it doesn't work)
* If a third file is given, die.
*/
if (argv[optind] == NULL) { /* neither infile nor outfile given */
opt.infile = stdin;
opt.outfile = stdout;
}
else if (argv[optind+1] && argv[optind+2]) { /* illegal third file */
fprintf (stderr, "%s: illegal parameter -- %s\n",
PROJECT, argv[optind+2]);
usage (stderr);
return 1;
}
else {
if (strcmp (argv[optind], "-") == 0) {
opt.infile = stdin; /* use stdin for input */
@ -731,35 +794,27 @@ static int process_commandline (int argc, char *argv[])
if (argv[optind+1] == NULL) {
opt.outfile = stdout; /* no outfile given */
}
else if (strcmp (argv[optind+1], "-") == 0) {
opt.outfile = stdout; /* use stdout for output */
}
else {
if (strcmp (argv[optind+1], "-") == 0) {
opt.outfile = stdout; /* use stdout for output */
}
else {
outfile_existed = !access (argv[optind+1], F_OK);
opt.outfile = fopen (argv[optind+1], "w");
if (opt.outfile == NULL) {
perror (PROJECT);
if (opt.infile != stdin)
fclose (opt.infile);
return 10;
}
}
if (argv[optind+2]) { /* illegal third file */
fprintf (stderr, "%s: illegal parameter -- %s\n",
PROJECT, argv[optind+2]);
usage (stderr);
opt.outfile = fopen (argv[optind+1], "w");
if (opt.outfile == NULL) {
perror (PROJECT);
if (opt.infile != stdin)
fclose (opt.infile);
if (opt.outfile != stdout) {
fclose (opt.outfile);
if (!outfile_existed) unlink (argv[optind+1]);
}
return 1;
return 10;
}
}
}
/*
* If no config file has as yet been specified, try getting it elsewhere.
*/
rc = get_config_file(); /* sets yyin and yyfilename */
if (rc) /* may change working directory */
return rc;
#if defined(DEBUG) || 0
fprintf (stderr, "Command line option settings (excerpt):\n");
fprintf (stderr, "- Padding: l%d o%d r%d u%d\n", opt.padding[BLEF],