pkgconf/pkg.c

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/*
* pkg.c
* higher-level dependency graph compilation, management and manipulation
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*
* Copyright (c) 2011, 2012 William Pitcock <nenolod@dereferenced.org>.
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*
* 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 BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "pkg.h"
#define PKG_CONFIG_EXT ".pc"
#define PKG_CONFIG_PATH_SZ (65535)
static inline const char *
pkg_get_pkgconfig_path(void)
{
static bool computed = false;
static char path[PKG_CONFIG_PATH_SZ];
char *env_path;
size_t len;
if (computed)
return path;
strncpy(path, PKG_DEFAULT_PATH, sizeof path);
len = strlen(PKG_DEFAULT_PATH);
env_path = getenv("PKG_CONFIG_PATH");
if (env_path != NULL)
{
strncat(path, ":", sizeof path - len - 1);
strncat(path, env_path, sizeof path - len - 2);
}
return path;
}
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pkg_t *
pkg_find(const char *name)
{
char locbuf[BUFSIZ];
char path[BUFSIZ];
const char *env_path;
int count = 0, pcount = 0;
FILE *f;
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env_path = pkg_get_pkgconfig_path();
while (env_path[count] != '\0')
{
if (env_path[count] != ':')
{
path[pcount] = env_path[count];
pcount++;
}
else
{
snprintf(locbuf, sizeof locbuf, "%s/%s.pc", path, name);
if (f = fopen(locbuf, "r"))
return parse_file(locbuf, f);
path[0] = '\0';
pcount = 0;
}
count++;
}
if (path[0] != '\0')
{
snprintf(locbuf, sizeof locbuf, "%s/%s.pc", path, name);
f = fopen(locbuf, "r");
}
return parse_file(locbuf, f);
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}
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/*
* pkg_compare_version(a, b)
*
* compare versions using RPM version comparison rules as described in the LSB.
*/
int
pkg_compare_version(const char *a, const char *b)
{
char oldch1, oldch2;
char *str1, *str2;
char *one, *two;
int ret;
bool isnum;
/* optimization: if version matches then it's the same version. */
if (!strcasecmp(a, b))
return 0;
str1 = LOCAL_COPY(a);
str2 = LOCAL_COPY(b);
one = str1;
two = str2;
while (*one && *two)
{
while (*one && !isalnum(*one))
one++;
while (*two && !isalnum(*two))
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two++;
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if (!(*one && *two))
break;
str1 = one;
str2 = two;
if (isdigit(*str1))
{
while (*str1 && isdigit(*str1))
str1++;
while (*str2 && isdigit(*str2))
str2++;
isnum = true;
}
else
{
while (*str1 && isalpha(*str1))
str1++;
while (*str2 && isalpha(*str2))
str2++;
isnum = false;
}
oldch1 = *str1;
oldch2 = *str2;
*str1 = '\0';
*str2 = '\0';
if (one == str1)
return -1;
if (two == str2)
return (isnum ? 1 : -1);
if (isnum)
{
int onelen, twolen;
while (*one == '0')
one++;
while (*two == '0')
two++;
onelen = strlen(one);
twolen = strlen(two);
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if (onelen > twolen)
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return 1;
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else if (twolen > onelen)
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return -1;
}
ret = strcmp(one, two);
if (ret)
return ret;
*str1 = oldch1;
*str2 = oldch2;
one = str1;
two = str2;
}
if ((!*one) && (!*two))
return 0;
if (!*one)
return -1;
return 1;
}
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/*
* pkg_get_comparator(pkgdep)
*
* returns the comparator used in a depgraph dependency node as a string.
*/
const char *
pkg_get_comparator(pkg_dependency_t *pkgdep)
{
switch(pkgdep->compare)
{
case PKG_LESS_THAN:
return "<";
case PKG_GREATER_THAN:
return ">";
case PKG_LESS_THAN_EQUAL:
return "<=";
case PKG_GREATER_THAN_EQUAL:
return ">=";
case PKG_EQUAL:
return "=";
case PKG_NOT_EQUAL:
return "!=";
case PKG_ANY:
return "(any)";
}
return "???";
}
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/*
* pkg_verify_dependency(pkgdep)
*
* verify a pkg_dependency_t node in the depgraph. if the dependency is solvable,
* return the appropriate pkg_t object, else NULL.
*/
pkg_t *
pkg_verify_dependency(pkg_dependency_t *pkgdep)
{
pkg_t *pkg;
pkg = pkg_find(pkgdep->package);
if (pkg == NULL)
return NULL;
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pkg->id = strdup(pkgdep->package);
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switch(pkgdep->compare)
{
case PKG_LESS_THAN:
if (pkg_compare_version(pkg->version, pkgdep->version) < 0)
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return pkg;
break;
case PKG_GREATER_THAN:
if (pkg_compare_version(pkg->version, pkgdep->version) > 0)
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return pkg;
break;
case PKG_LESS_THAN_EQUAL:
if (pkg_compare_version(pkg->version, pkgdep->version) <= 0)
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return pkg;
break;
case PKG_GREATER_THAN_EQUAL:
if (pkg_compare_version(pkg->version, pkgdep->version) >= 0)
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return pkg;
break;
case PKG_EQUAL:
if (pkg_compare_version(pkg->version, pkgdep->version) == 0)
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return pkg;
break;
case PKG_NOT_EQUAL:
if (pkg_compare_version(pkg->version, pkgdep->version) != 0)
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return pkg;
break;
case PKG_ANY:
default:
return pkg;
}
return NULL;
}
/*
* pkg_verify_graph(root, depth)
*
* verify the graph dependency nodes are satisfiable by walking the tree using
* pkg_traverse().
*/
void
pkg_verify_graph(pkg_t *root, int depth)
{
pkg_traverse(root, NULL, NULL, depth);
}
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/*
* pkg_traverse(root, pkg_traverse_func, data, maxdepth)
*
* walk the dependency graph up to maxdepth levels. -1 means infinite recursion.
*/
void
pkg_traverse(pkg_t *root,
void (*pkg_traverse_func)(pkg_t *package, void *data),
void *data,
int maxdepth)
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{
pkg_dependency_t *node;
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if (maxdepth == 0)
return;
foreach_list_entry(root->requires, node)
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{
pkg_t *pkgdep;
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if (*node->package == '\0')
continue;
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pkgdep = pkg_verify_dependency(node);
if (pkgdep == NULL)
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{
fprintf(stderr, "Package %s was not found in the pkg-config search path.\n", node->package);
fprintf(stderr, "Perhaps you should add the directory containing `%s.pc'\n", node->package);
fprintf(stderr, "to the PKG_CONFIG_PATH environment variable\n");
fprintf(stderr, "No package '%s' found\n", node->package);
exit(EXIT_FAILURE);
}
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pkg_traverse(pkgdep, pkg_traverse_func, data, maxdepth - 1);
}
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if (pkg_traverse_func != NULL)
pkg_traverse_func(root, data);
}