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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2009 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* Glenn Fowler
* AT&T Research
*
* include style search support
*/
#include <ast.h>
#include <error.h>
#include <ls.h>
#define directory(p,s) (stat((p),(s))>=0&&S_ISDIR((s)->st_mode))
#define regular(p,s) (stat((p),(s))>=0&&(S_ISREG((s)->st_mode)||streq(p,"/dev/null")))
typedef struct Dir_s /* directory list element */
{
struct Dir_s* next; /* next in list */
char dir[1]; /* directory path */
} Dir_t;
static struct /* directory list state */
{
Dir_t* head; /* directory list head */
Dir_t* tail; /* directory list tail */
} state;
/*
* append dir to pathfind() include list
*/
int
pathinclude(const char* dir)
{
register Dir_t* dp;
struct stat st;
if (dir && *dir && !streq(dir, ".") && directory(dir, &st))
{
for (dp = state.head; dp; dp = dp->next)
if (streq(dir, dp->dir))
return 0;
if (!(dp = oldof(0, Dir_t, 1, strlen(dir))))
return -1;
strcpy(dp->dir, dir);
dp->next = 0;
if (state.tail)
state.tail = state.tail->next = dp;
else
state.head = state.tail = dp;
}
return 0;
}
/*
* return path to name using pathinclude() list
* path placed in <buf,size>
* if lib!=0 then pathpath() attempted after include search
* if type!=0 and name has no '.' then file.type also attempted
* any *: prefix in lib is ignored (discipline library dictionary support)
*/
char*
pathfind(const char* name, const char* lib, const char* type, char* buf, size_t size)
{
register Dir_t* dp;
register char* s;
char tmp[PATH_MAX];
struct stat st;
if (((s = strrchr(name, '/')) || (s = (char*)name)) && strchr(s, '.'))
type = 0;
/*
* always check the unadorned path first
* this handles . and absolute paths
*/
if (regular(name, &st))
{
strncopy(buf, name, size);
return buf;
}
if (type)
{
sfsprintf(buf, size, "%s.%s", name, type);
if (regular(buf, &st))
return buf;
}
if (*name == '/')
return 0;
/*
* check the directory of the including file
* on the assumption that error_info.file is properly stacked
*/
if (error_info.file && (s = strrchr(error_info.file, '/')))
{
sfsprintf(buf, size, "%-.*s%s", s - error_info.file + 1, error_info.file, name);
if (regular(buf, &st))
return buf;
if (type)
{
sfsprintf(buf, size, "%-.*s%s%.s", s - error_info.file + 1, error_info.file, name, type);
if (regular(buf, &st))
return buf;
}
}
/*
* check the include dir list
*/
for (dp = state.head; dp; dp = dp->next)
{
sfsprintf(tmp, sizeof(tmp), "%s/%s", dp->dir, name);
if (pathpath(buf, tmp, "", PATH_REGULAR))
return buf;
if (type)
{
sfsprintf(tmp, sizeof(tmp), "%s/%s.%s", dp->dir, name, type);
if (pathpath(buf, tmp, "", PATH_REGULAR))
return buf;
}
}
/*
* finally a lib related search on PATH
*/
if (lib)
{
if (s = strrchr((char*)lib, ':'))
lib = (const char*)s + 1;
sfsprintf(tmp, sizeof(tmp), "lib/%s/%s", lib, name);
if (pathpath(buf, tmp, "", PATH_REGULAR))
return buf;
if (type)
{
sfsprintf(tmp, sizeof(tmp), "lib/%s/%s.%s", lib, name, type);
if (pathpath(buf, tmp, "", PATH_REGULAR))
return buf;
}
}
return 0;
}
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