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config.c
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config.c
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/* config.c:
*
* functions that deal with the particular configuration.
*
* jim frost 10.03.89
*
* Copyright 1989, 1990, 1991, 1993 Jim Frost.
* See included file "copyright.h" for complete copyright information.
*/
#include "copyright.h"
#include <ctype.h> /* must here for debugging version under AIX */
#include "xloadimage.h"
#include <X11/Xos.h>
#include <sys/stat.h>
#ifndef VMS
#include <pwd.h>
#endif
#include <errno.h>
#ifndef IS_BSD
#include <unistd.h>
#endif
/* SUPPRESS 530 */
/* SUPPRESS 560 */
extern int errno;
struct filter *Filters = (struct filter *)NULL;
static unsigned int NumPaths= 0;
static unsigned int NumExts= 0;
static char *Paths[BUFSIZ];
static char *Exts[BUFSIZ];
static char *PathToken= "path";
static char *ExtToken= "extension";
static char *FilterToken= "filter";
static void addFilter(extension, filter)
char *extension, *filter;
{ struct filter *f, *t;
f= (struct filter *)lmalloc(sizeof(struct filter));
f->extension= dupString(extension);
f->filter= dupString(filter);
f->next= NULL;
if (Filters) {
for (t= Filters; t->next; t= t->next)
/* EMPTY */
;
t->next= f;
}
else
Filters= f;
}
enum parse_state {
parse_void,
parse_state_token,
parse_path,
parse_extension,
parse_filter_name,
parse_filter_extension
};
/* this function eats up whitespace, incrementing the line number at
* each newline
*/
static void skip_whitespace(f, linenum)
FILE *f;
unsigned int *linenum;
{
int c;
for (;;) {
c = fgetc(f);
switch (c) {
case EOF:
return;
case '\n':
(*linenum)++;
/* FALLTHRU */
case '\r':
case ' ':
case '\t':
continue;
default:
ungetc(c, f);
return;
}
}
}
static void readPathsAndExts(name)
char *name;
{ FILE *f;
char buf[BUFSIZ];
char filter_name[BUFSIZ];
enum parse_state state;
unsigned int linenum;
unsigned int a;
int c;
if (! (f= fopen(name, "r")))
return;
state = parse_void;
linenum= 0;
/* this is the token scanner. i suppose i could have used lex.
*/
a = 0;
for (;;) {
c = fgetc(f);
if (a >= BUFSIZ) {
fprintf(stderr, "%s: %d: Buffer overflow (token too long, sorry).\n", name, linenum);
fclose(f);
return;
}
switch (c) {
case EOF:
return;
case '\n': /* increment line count */
linenum++;
/* FALLTHRU */
case '\r': /* treated as generic white space */
case ' ':
case '\t':
buf[a] = '\0';
a = 0;
/* skip forward until next character */
skip_whitespace(f, &linenum);
c = fgetc(f);
if (c == '=') {
state = parse_state_token;
skip_whitespace(f, &linenum);
}
else if (c != EOF)
ungetc(c, f);
break;
case '=':
buf[a] = '\0';
a = 0;
state = parse_state_token;
skip_whitespace(f, &linenum);
break;
case '#': /* comment */
for (;;) {
c = fgetc(f);
switch (c) { /* eat everything to newline or EOF */
case '\n':
linenum++;
case EOF:
break;
default:
continue;
}
break;
}
/* terminate token
*/
buf[a] = '\0';
a = 0;
break;
case '"': /* search for end quote */
while ((c = fgetc(f)) != EOF) {
if (a >= BUFSIZ) {
fprintf(stderr, "%s: %d: Buffer overflow while reading string literal.\n",
name, linenum);
fclose(f);
return;
}
switch (c) {
case '"':
goto done_quote;
case '\r':
fprintf(stderr, "%s: %d: Unquoted return character inside string literal.\n",
name, linenum);
fclose(f);
return;
case '\n':
fprintf(stderr, "%s: %d: Unquoted newline inside string literal.\n", name,
linenum);
fclose(f);
return;
case '\\':
c = fgetc(f);
if (c == EOF)
goto done_quote;
if (c == '\n')
linenum++;
/* FALLTHRU */
default:
buf[a++] = c;
continue;
}
}
done_quote:
continue;
case '\\': /* literal quote */
c = fgetc(f);
if (c == EOF)
continue;
if (c == '\n')
linenum++;
/* FALLTHRU */
default:
buf[a++] = c;
continue;
}
/* this disallows nil-string tokens. thus "" is always ignored.
*/
if (buf[0] == '\0')
continue;
/* this handles a token depending on the parser state
*/
switch (state) {
case parse_void:
fprintf(stderr, "%s: %d: Syntax error in defaults file\n", name, linenum);
fclose(f);
return;
case parse_state_token:
if (!strncmp(buf, PathToken, strlen(PathToken)))
state= parse_path;
else if (!strncmp(buf, ExtToken, strlen(ExtToken)))
state= parse_extension;
else if (!strncmp(buf, FilterToken, strlen(FilterToken)))
state= parse_filter_name;
else {
fprintf(stderr, "%s: %d: Unknown section specifier '%s'.\n",
name, linenum, buf);
return;
}
break;
case parse_path:
if (NumPaths < BUFSIZ - 1)
Paths[NumPaths++]= expandPath(buf);
else {
fprintf(stderr, "%s: %d: Path table overflow\n", name, linenum);
fclose(f);
return;
}
break;
case parse_extension:
if (NumExts < BUFSIZ - 1)
Exts[NumExts++]= dupString(buf);
else {
fprintf(stderr, "%s: %d: Extension table overflow\n", name, linenum);
fclose(f);
return;
}
break;
case parse_filter_name: /* name of filter program */
strcpy(filter_name, buf);
state= parse_filter_extension;
break;
case parse_filter_extension:
addFilter(buf, filter_name);
break;
}
}
}
void loadPathsAndExts()
{ static int havepaths= 0;
#ifndef VMS
struct passwd *pw;
#endif
char buf[BUFSIZ];
if (havepaths)
return;
havepaths= 1;
#ifdef VMS
sprintf(buf, "/sys$login:xloadimage.rc");
#else /* !VMS */
addFilter(".Z", "uncompress -c"); /* std UNIX uncompress */
addFilter(".gz", "gzip -cd"); /* same, new extension */
if (! (pw= (struct passwd *)getpwuid(getuid()))) {
printf("Can't find your password file entry?!?\n");
return;
}
sprintf(buf, "%s/.xloadimagerc", pw->pw_dir);
#endif /* !VMS */
if (! access(buf, R_OK)) {
readPathsAndExts(buf);
return; /* don't read system file if user has one */
}
#ifdef SYSPATHFILE
readPathsAndExts(SYSPATHFILE);
#endif
}
static int fileIsOk(fullname, sbuf)
char *fullname;
struct stat *sbuf;
{
if ((sbuf->st_mode & S_IFMT) == S_IFDIR) /* is a directory */
return(0);
return(access(fullname, R_OK)); /* we can read it */
}
/* find an image with paths and extensions from defaults files. returns
* -1 if access denied or not found, 0 if ok.
*/
int findImage(name, fullname)
char *name, *fullname;
{ unsigned int p, e;
struct stat sbuf;
strcpy(fullname, name);
if (!strcmp(name, "stdin")) /* stdin is special name */
return(0);
/* look for name and name with compress extension
*/
if (! stat(fullname, &sbuf))
return(fileIsOk(fullname, &sbuf));
#ifndef NO_COMPRESS
strcat(fullname, ".Z");
if (! stat(fullname, &sbuf))
return(fileIsOk(fullname, &sbuf));
#endif
for (p= 0; p < NumPaths; p++) {
#ifdef VMS
sprintf(fullname, "%s%s", Paths[p], name);
#else
sprintf(fullname, "%s/%s", Paths[p], name);
#endif
if (! stat(fullname, &sbuf))
return(fileIsOk(fullname, &sbuf));
#ifndef NO_COMPRESS
strcat(fullname, ".Z");
if (! stat(fullname, &sbuf))
#endif
return(fileIsOk(fullname, &sbuf));
for (e= 0; e < NumExts; e++) {
#ifdef VMS
sprintf(fullname, "%s%s%s", Paths[p], name, Exts[e]);
#else
sprintf(fullname, "%s/%s%s", Paths[p], name, Exts[e]);
#endif
if (! stat(fullname, &sbuf))
return(fileIsOk(fullname, &sbuf));
#ifndef NO_COMPRESS
strcat(fullname, ".Z");
if (! stat(fullname, &sbuf))
return(fileIsOk(fullname, &sbuf));
#endif
}
}
for (e= 0; e < NumExts; e++) {
sprintf(fullname, "%s%s", name, Exts[e]);
if (! stat(fullname, &sbuf))
return(fileIsOk(fullname, &sbuf));
#ifndef NO_COMPRESS
strcat(fullname, ".Z");
if (! stat(fullname, &sbuf))
return(fileIsOk(fullname, &sbuf));
#endif
}
errno= ENOENT; /* file not found */
return(-1);
}
/* list images along our path
*/
void listImages()
{ unsigned int a;
char buf[BUFSIZ];
if (!NumPaths) {
printf("No image path\n");
return;
}
for (a= 0; a < NumPaths; a++) {
printf("%s:\n", Paths[a]);
fflush(stdout);
#ifdef VMS
sprintf(buf, "directory %s", Paths[a]);
#else
sprintf(buf, "ls %s", Paths[a]);
#endif
if (system(buf) < 0) {
#ifdef VMS
perror("directory");
#else
perror("ls");
#endif
return;
}
}
return;
}
void showConfiguration()
{ int a;
struct filter *f;
if (NumPaths) {
printf("Image path:");
for (a= 0; a < NumPaths; a++)
printf(" %s", Paths[a]);
printf("\n");
}
else
printf("No image path\n");
if (NumExts) {
printf("Image extensions:");
for (a= 0; a < NumExts; a++)
printf(" %s", Exts[a]);
printf("\n");
}
else
printf("No image extensions\n");
if (Filters) {
printf("Filters:\n");
for (f= Filters; f; f= f->next)
printf(" \"%s\" -> \"%s\"\n", f->extension, f->filter);
printf("\n");
}
else
printf("No filters\n");
}
char *expandPath(p)
char *p;
{ char buf1[BUFSIZ], buf2[BUFSIZ];
int b1, b2, var;
char *ptr;
char *getenv();
buf1[0] = '\0';
buf2[0] = '\0';
b1 = 0;
b2 = 0;
var = 0;
while(*p) {
if(isspace(*p)) break;
#ifndef VMS
if (*p == '$') var++;
#endif
else if(*p == '~') {
buf1[b1] = '\0';
strcat(buf1, getenv("HOME"));
b1 = strlen(buf1);
var = 0;
}
else if(*p == '/' || *p == '}') {
if(var) {
buf1[b1] = '\0';
buf2[b2] = '\0';
strcat(buf1, getenv(buf2));
b1 = strlen(buf1);
buf2[0] = '\0';
b2 = 0;
var = 0;
}
if(*p == '/') {
buf1[b1] = *p;
b1++;
}
}
else if(var) {
if(*p != '{') {
buf2[b2] = *p;
b2++;
}
}
else {
buf1[b1] = *p;
b1++;
}
p++;
}
buf1[b1] = '\0';
if((b2 = strlen(buf1)) > 0) {
ptr = (char *)lmalloc((unsigned) b2+1);
strcpy(ptr, buf1);
return(ptr);
}
else
return(NULL);
}