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/* "findexec.c" was part of DLD, a dynamic link/unlink editor for C.
Copyright (C) 1990 by W. Wilson Ho.
The author can be reached electronically by how@cs.ucdavis.edu or
through physical mail at:
W. Wilson Ho
Division of Computer Science
University of California at Davis
Davis, CA 95616
Fri Sep 14 22:16:14 1990 Edgar Roeder (edgar at megamaster)
* added a separate DLDPATH environment variable in
dld_find_executable so that users may specify a special path
for object modules.
Thu Feb 3 01:46:16 1994 Aubrey Jaffer
* find_exec.c (dld_find_executable): added stat check for
linux so that it doesn't think directories with the same name
as the program are executable.
Wed Feb 21 23:06:35 1996 Aubrey Jaffer
* find_exec.c: extracted for general use. Generalized to
MS-DOS. */
/* This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 1, or (at your option) any
later version. */
/* Given a filename, dld_find_executable searches the directories
listed in the environment variable PATH for a file with that
filename. A new copy of the complete path name of that file is
returned. This new string may be disposed by free() later on. */
#ifndef __MINGW32__
# ifndef PLAN9
# include <sys/file.h>
# include <sys/param.h>
# endif
# ifdef linux
# include <stdlib.h>
# include <sys/stat.h>
# include <unistd.h> /* for X_OK define */
# endif
# ifdef __SVR4
# include <string.h>
# include <stdlib.h>
# include <sys/stat.h>
# include <unistd.h> /* for X_OK define */
# else
# ifdef __sgi__
# include <string.h>
# include <stdlib.h>
# include <sys/stat.h>
# include <unistd.h> /* for X_OK define */
# else
# ifdef PLAN9
# include <u.h>
# include <libc.h>
# define getcwd getwd
# define MAXPATHLEN 256 /* arbitrary? */
# define X_OK AEXEC
# else
# include <strings.h>
# endif
# endif
# endif
# ifdef __amigaos__
# include <stdlib.h>
# include <sys/stat.h>
# include <unistd.h>
# endif
# ifndef __STDC__
# define const /**/
# endif
# ifdef __FreeBSD__
/* This might be same for 44bsd derived system. */
# include <sys/types.h>
# include <sys/stat.h>
# endif
# ifdef __NetBSD__
# include <stdlib.h>
# include <unistd.h>
# endif
# ifdef __OpenBSD__
/* This might be same for 44bsd derived system. */
# include <stdlib.h>
# include <unistd.h>
# include <sys/types.h>
# include <sys/stat.h>
# endif
# ifdef __alpha
# include <string.h>
# include <stdlib.h>
# include <sys/types.h>
# include <sys/stat.h>
# endif
# ifdef GO32
# include <sys/stat.h>
# endif
# ifndef DEFAULT_PATH
# define DEFAULT_PATH ".:~/bin::/usr/local/bin:/usr/new:/usr/ucb:/usr/bin:/bin:/usr/hosts"
# endif
static char *copy_of(s)
register const char *s;
{
register char *p = (char *) malloc(strlen(s)+1);
if (!p) return 0;
*p = 0;
strcpy(p, s);
return p;
}
/* ABSOLUTE_FILENAME_P(fname): True if fname is an absolute filename */
# ifdef atarist
# define ABSOLUTE_FILENAME_P(fname) ((fname[0] == '/') || \
(fname[0] && (fname[1] == ':')))
# else
# define ABSOLUTE_FILENAME_P(fname) (fname[0] == '/')
# endif /* atarist */
char *dld_find_executable(name)
const char *name;
{
char *search;
register char *p;
char tbuf[MAXPATHLEN];
if (ABSOLUTE_FILENAME_P(name))
return access(name, X_OK) ? 0 : copy_of(name);
if (strchr(name, '/')) {
strcpy (tbuf, "."); /* in case getcwd doesn't work */
getcwd(tbuf, MAXPATHLEN);
if ((name[0] == '.') && (name[1] == '/')) {
strcat(tbuf, name + 1);
} else {
if ('/' != tbuf[strlen(tbuf) - 1]) strcat(tbuf, "/");
strcat(tbuf, name);
}
return copy_of(tbuf);
}
if (((search = (char *) getenv("DLDPATH")) == 0) &&
((search = (char *) getenv("PATH")) == 0))
search = DEFAULT_PATH;
p = search;
while (*p) {
register char *next = tbuf;
if (p[0]=='~' && p[1]=='/' && getenv("HOME")) {
strcpy(tbuf, (char *)getenv("HOME"));
next = tbuf + strlen(tbuf);
p++;
}
/* Copy directory name into [tbuf] */
while (*p && *p != ':') *next++ = *p++;
*next = 0;
if (*p) p++;
if (tbuf[0] == '.' && tbuf[1] == 0)
getcwd(tbuf, MAXPATHLEN); /* was getwd(tbuf); */
else if (tbuf[0]=='~' && tbuf[1]==0 && getenv("HOME"))
strcpy(tbuf, (char *)getenv("HOME"));
strcat(tbuf, "/");
strcat(tbuf, name);
if (access(tbuf, X_OK) == 0) {
# ifndef hpux
# ifndef ultrix
# ifndef __MACH__
# ifndef PLAN9
struct stat stat_temp;
if (stat(tbuf, &stat_temp)) continue;
if (S_IFREG != (S_IFMT & stat_temp.st_mode)) continue;
# endif /* PLAN9 */
# endif /* __MACH__ */
# endif/* ultrix */
# endif /* hpux */
return copy_of(tbuf);
}
}
return 0;
}
#endif /* ndef MSDOS */
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