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/*
* dependency.c
* dependency parsing and management
*
* Copyright (c) 2011, 2012, 2013 pkgconf authors (see AUTHORS).
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* This software is provided 'as is' and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising
* from the use of this software.
*/
#include "pkg.h"
#include "bsdstubs.h"
/*
* pkg_dependency_parse(pkg, depends)
*
* Add requirements to a .pc file.
* Commas are counted as whitespace, as to allow:
* @SUBSTVAR@, zlib
* getting substituted to:
* , zlib.
*/
typedef enum {
OUTSIDE_MODULE = 0,
INSIDE_MODULE_NAME = 1,
BEFORE_OPERATOR = 2,
INSIDE_OPERATOR = 3,
AFTER_OPERATOR = 4,
INSIDE_VERSION = 5
} parse_state_t;
#define DEBUG_PARSE 0
static inline pkg_dependency_t *
pkg_dependency_add(pkg_dependency_t *head, const char *package, size_t package_sz, const char *version, size_t version_sz, pkg_comparator_t compare)
{
pkg_dependency_t *dep;
dep = calloc(sizeof(pkg_dependency_t), 1);
dep->package = strndup(package, package_sz);
if (version_sz != 0)
dep->version = strndup(version, version_sz);
dep->compare = compare;
dep->prev = head;
if (dep->prev != NULL)
dep->prev->next = dep;
#if DEBUG_PARSE
fprintf(error_msgout, "--> %s %d %s\n", dep->package, dep->compare, dep->version);
#endif
return dep;
}
pkg_dependency_t *
pkg_dependency_append(pkg_dependency_t *head, pkg_dependency_t *tail)
{
pkg_dependency_t *node;
if (head == NULL)
return tail;
/* skip to end of list */
PKG_FOREACH_LIST_ENTRY(head, node)
{
if (node->next == NULL)
break;
}
node->next = tail;
tail->prev = node;
return head;
}
void
pkg_dependency_free(pkg_dependency_t *head)
{
pkg_dependency_t *node, *next;
PKG_FOREACH_LIST_ENTRY_SAFE(head, next, node)
{
if (node->package != NULL)
free(node->package);
if (node->version != NULL)
free(node->version);
free(node);
}
}
pkg_dependency_t *
pkg_dependency_parse_str(pkg_dependency_t *deplist_head, const char *depends)
{
parse_state_t state = OUTSIDE_MODULE;
pkg_dependency_t *deplist = NULL;
pkg_comparator_t compare = PKG_ANY;
char cmpname[PKG_BUFSIZE];
char buf[PKG_BUFSIZE];
size_t package_sz = 0, version_sz = 0;
char *start = buf;
char *ptr = buf;
char *vstart = NULL;
char *package = NULL, *version = NULL;
char *cnameptr = cmpname;
memset(cmpname, '\0', sizeof cmpname);
strlcpy(buf, depends, sizeof buf);
strlcat(buf, " ", sizeof buf);
while (*ptr)
{
switch (state)
{
case OUTSIDE_MODULE:
if (!PKG_MODULE_SEPARATOR(*ptr))
state = INSIDE_MODULE_NAME;
break;
case INSIDE_MODULE_NAME:
if (isspace(*ptr))
{
const char *sptr = ptr;
while (*sptr && isspace(*sptr))
sptr++;
if (*sptr == '\0')
state = OUTSIDE_MODULE;
else if (PKG_MODULE_SEPARATOR(*sptr))
state = OUTSIDE_MODULE;
else if (PKG_OPERATOR_CHAR(*sptr))
state = BEFORE_OPERATOR;
else
state = OUTSIDE_MODULE;
}
else if (PKG_MODULE_SEPARATOR(*ptr))
state = OUTSIDE_MODULE;
else if (*(ptr + 1) == '\0')
{
ptr++;
state = OUTSIDE_MODULE;
}
if (state != INSIDE_MODULE_NAME && start != ptr)
{
char *iter = start;
while (PKG_MODULE_SEPARATOR(*iter))
iter++;
package = iter;
package_sz = ptr - iter;
#if DEBUG_PARSE
fprintf(error_msgout, "Found package: %s\n", package);
#endif
start = ptr;
}
if (state == OUTSIDE_MODULE)
{
deplist = pkg_dependency_add(deplist, package, package_sz, NULL, 0, compare);
if (deplist_head == NULL)
deplist_head = deplist;
compare = PKG_ANY;
package_sz = 0;
version_sz = 0;
}
break;
case BEFORE_OPERATOR:
if (PKG_OPERATOR_CHAR(*ptr))
{
state = INSIDE_OPERATOR;
*cnameptr++ = *ptr;
}
break;
case INSIDE_OPERATOR:
if (!PKG_OPERATOR_CHAR(*ptr))
{
state = AFTER_OPERATOR;
compare = pkg_comparator_lookup_by_name(cmpname);
}
else
*cnameptr++ = *ptr;
break;
case AFTER_OPERATOR:
#if DEBUG_PARSE
fprintf(error_msgout, "Found op: %d\n", compare);
#endif
if (!isspace(*ptr))
{
vstart = ptr;
state = INSIDE_VERSION;
}
break;
case INSIDE_VERSION:
if (PKG_MODULE_SEPARATOR(*ptr) || *(ptr + 1) == '\0')
{
version = vstart;
version_sz = ptr - vstart;
state = OUTSIDE_MODULE;
#if DEBUG_PARSE
fprintf(error_msgout, "Found version: %s\n", version);
#endif
deplist = pkg_dependency_add(deplist, package, package_sz, version, version_sz, compare);
if (deplist_head == NULL)
deplist_head = deplist;
compare = PKG_ANY;
package_sz = 0;
version_sz = 0;
}
if (state == OUTSIDE_MODULE)
start = ptr;
break;
}
ptr++;
}
return deplist_head;
}
pkg_dependency_t *
pkg_dependency_parse(pkg_t *pkg, const char *depends)
{
pkg_dependency_t *list = NULL;
char *kvdepends = pkg_tuple_parse(pkg->vars, depends);
list = pkg_dependency_parse_str(list, kvdepends);
free(kvdepends);
return list;
}
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