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/* Copyright (c) 1993-2008 by Richard Kelsey and Jonathan Rees.
See file COPYING. */
#include <stdio.h>
#include <stdlib.h> /* for getenv(), etc. (POSIX?/ANSI) */
#include <string.h> /* for strncpy(), etc. (POSIX/ANSI) */
#include <pwd.h> /* for getpwnam() (POSIX.1) */
#include <unistd.h> /* for sysconf(), etc. (POSIX.1/.2)*/
#include <errno.h>
#include <sys/stat.h>
#include <locale.h> /* ISO C99 */
#include "sysdep.h"
#include "c-mods.h"
/*
Expanding Unix filenames
Unix Sucks
Richard Kelsey Wed Jan 17 21:40:26 EST 1990
Later modified by others who wish to remain anonymous
Expands initial ~ and ~/ in string `name', leaving the result in `buffer'.
`buffer_len' is the length of `buffer'.
Note: strncpy(x, y, n) copies from y to x.
*/
char *s48_expand_file_name (char *name, char *buffer, int buffer_len)
{
#define USER_NAME_SIZE 256
char *dir, *p, user_name[USER_NAME_SIZE];
struct passwd *user_data;
int dir_len, i;
int name_len = strlen(name);
dir = 0;
if (name[0] == '~') {
name++; name_len--;
if (name[0] == '/' || name[0] == 0) {
dir = getenv("HOME"); }
else {
for (i = 0, p = name; i < name_len && *p != '/'; i++, p++)
if (i > (USER_NAME_SIZE - 2)) {
fprintf(stderr,
"\ns48_expand_file_name: user name longer than %d characters\n",
USER_NAME_SIZE - 3);
return(NULL); };
strncpy(user_name, name, i);
user_name[i] = 0;
user_data = getpwnam(user_name);
if (!user_data) {
fprintf(stderr, "\ns48_expand_file_name: unknown user \"%s\"\n",
user_name);
return(NULL); };
name_len -= i;
name = p;
dir = user_data->pw_dir; } }
else if (name[0] == '$') {
name++; name_len--;
for (i = 0, p = name; i < name_len && *p != '/'; i++, p++)
if (i > (USER_NAME_SIZE - 2)) {
fprintf(stderr,
"\ns48_expand_file_name: environment variable longer than %d characters\n",
USER_NAME_SIZE - 3);
return(NULL); };
strncpy(user_name, name, i);
user_name[i] = 0;
name_len -= i;
name = p;
dir = getenv(user_name); }
if (dir) {
dir_len = strlen(dir);
if ((name_len + dir_len + 1) > buffer_len) {
fprintf(stderr, "\ns48_expand_file_name: supplied buffer is too small\n");
return(NULL); };
strncpy(buffer, dir, dir_len);
strncpy(buffer + dir_len, name, name_len);
buffer[name_len + dir_len] = 0; }
else {
if ((name_len + 1) > buffer_len) {
fprintf(stderr, "\ns48_expand_file_name: supplied buffer is too small\n");
return(NULL); };
strncpy(buffer, name, name_len);
buffer[name_len] = 0; }
return(buffer);
}
/* test routine
main(argc, argv)
int argc;
char *argv[];
{
char buffer[32];
s48_expand_file_name(argv[1], buffer, 32);
printf("%s\n", buffer);
return(0);
}
*/
/* Driver loop for tail-recursive calls */
long s48_return_value;
long
s48_run_machine(long (*proc) (void))
{
while (proc != 0)
proc = (long (*) (void)) (*proc)();
return s48_return_value;
}
unsigned char *
ps_error_string(long the_errno)
{
return((unsigned char *)strerror(the_errno));
}
/* Getting the length of a file. */
long
s48_get_file_size(unsigned char *name)
{
struct stat file_data;
int status;
if (-1 == stat((char*)name, &file_data) ||
! S_ISREG(file_data.st_mode))
return -1;
else
return file_data.st_size;
}
/* encoding of argv */
char*
s48_get_os_string_encoding(void)
{
static char setlocale_called = PSFALSE;
char *codeset;
static char* encoding = NULL;
/* Mike has no clue what the rationale for needing this is. */
if (!setlocale_called)
{
setlocale(LC_CTYPE, "");
setlocale_called = PSTRUE;
}
if (encoding == NULL)
{
codeset = nl_langinfo(CODESET); /* this ain't reentrant */
encoding = malloc(strlen(codeset) + 1);
if (encoding == NULL)
return NULL;
strcpy(encoding, codeset);
}
return encoding;
}
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