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/* $XConsortium: miscfuncs.c,v 1.7 94/12/01 17:15:05 kaleb Exp $ */
/* $XFree86: xc/programs/xmh/miscfuncs.c,v 3.3 1996/12/26 01:41:01 dawes Exp $ */
#include <X11/Xos.h>
#ifndef X_NOT_POSIX
#include <dirent.h>
#else
#ifdef SYSV
#include <dirent.h>
#else
#ifdef USG
#include <dirent.h>
#else
#include <sys/dir.h>
#ifndef dirent
#define dirent direct
#endif
#endif
#endif
#endif
#ifdef X_NOT_STDC_ENV
char *malloc();
char *realloc();
#else
#include <stdlib.h>
#endif
#if defined(SYSV) && (defined(i386) || defined(MOTOROLA)) || defined(MINIX)
/* These systems don't have the ftruncate() system call, so we emulate it.
* This emulation can only shorten, not lengthen.
* For convenience, we pass in the name of the file, even though the
* real ftruncate doesn't.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#define CHUNKSIZE 1024
int ftruncate_emu(fd, length, name)
int fd;
off_t length;
char *name;
{
char tmp_file[15];
int new_fid, bytes_left, i;
unsigned char buffer[CHUNKSIZE];
struct stat stat_val;
/* Open a temp file. */
sprintf(tmp_file, ".xmhtmp%d~", getpid());
(void) unlink(tmp_file);
new_fid = open(tmp_file, O_RDWR | O_CREAT);
lseek(fd, (off_t)0, 0);
/* Copy original file to temp file. */
for (i = 0; i < length / CHUNKSIZE; i++) {
if (read(fd, buffer, CHUNKSIZE) != CHUNKSIZE) {
(void)fprintf(stderr, "xmh: read error in ftruncate emulation\n");
return -1;
}
else if (write(new_fid, buffer, CHUNKSIZE) != CHUNKSIZE) {
(void)fprintf(stderr, "xmh: write error in ftruncate emulation\n");
return -1;
}
}
bytes_left = length % CHUNKSIZE;
if (read(fd, buffer, bytes_left) != bytes_left) {
(void)fprintf(stderr, "xmh: read error in ftruncate() emulation\n");
return -1;
}
else if (write(new_fid, buffer, bytes_left) != bytes_left) {
(void)fprintf(stderr, "xmh: write error in ftruncate() emulation\n");
return -1;
}
/* Set mode of temp file to that of original file. */
(void) fstat(fd, &stat_val);
(void) chmod(tmp_file, stat_val.st_mode);
/* Close files, delete original, rename temp file to original. */
(void) myclose(new_fid);
(void) myclose(fd);
(void) unlink(name); /* remove original */
(void) rename(tmp_file, name); /* rename temp file */
/* If we weren't going to close the file right away in the one
place this is called from, we'd have to do something like this:
new_fid = myopen(name, O_RDWR, 0666);
if (new_fid != fd) {
dup2(new_fid, fd);
close(new_fid);
}
but the file does get closed, so we don't bother. */
return 0;
}
#endif /* SYSV variant that needs ftruncate emulation */
/*
** This code is by Rich Salz (rsalz@bbn.com), and ported to SVR4
** by David Elliott (dce@smsc.sony.com). No copyrights were found
** in the original. Subsequently modified by Bob Scheifler.
*/
/* A convenient shorthand. */
typedef struct dirent ENTRY;
/* Initial guess at directory size. */
#define INITIAL_SIZE 20
static int StrCmp(a, b)
char **a, **b;
{
return strcmp(*a, *b);
}
int
ScanDir(Name, List, Selector)
char *Name;
char ***List;
int (*Selector)();
{
register char **names;
register ENTRY *E;
register DIR *Dp;
register int i;
register int size;
/* Get initial list space and open directory. */
size = INITIAL_SIZE;
if (!(names = (char **)malloc(size * sizeof(char *))) ||
!(Dp = opendir(Name)))
return(-1);
/* Read entries in the directory. */
for (i = 0; E = readdir(Dp); )
if (!Selector || (*Selector)(E->d_name)) {
/* User wants them all, or he wants this one. */
if (++i >= size) {
size <<= 1;
names = (char**)realloc((char *)names, size * sizeof(char*));
if (!names) {
closedir(Dp);
return(-1);
}
}
/* Copy the entry. */
if (!(names[i - 1] = (char *)malloc(strlen(E->d_name) + 1))) {
closedir(Dp);
return(-1);
}
(void)strcpy(names[i - 1], E->d_name);
}
/* Close things off. */
names[i] = (char *)0;
*List = names;
closedir(Dp);
/* Sort? */
if (i)
qsort((char *)names, i, sizeof(char *), (int (*)())StrCmp);
return(i);
}
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