kc3-lang/pkgconf/parse.c

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• Show log

  Commit

• Author : Alyx
  Date : 2012-01-15 19:03:54
  Hash : d0639b33
  Message : Make pkg_find() follow the PKG_CONFIG_PATH environmental variable, if available.

• parse.c

• /*
   * parse.c
   * Parser for .pc file.
   *
   * Copyright (c) 2011 William Pitcock <nenolod@dereferenced.org>.
   *
   * 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"
  
  static pkg_tuple_t *
  tuple_add(pkg_tuple_t *parent, const char *key, const char *value)
  {
  	pkg_tuple_t *tuple = calloc(sizeof(pkg_tuple_t), 1);
  
  	tuple->key = strdup(key);
  	tuple->value = strdup(value);
  
  	tuple->next = parent;
  	if (tuple->next != NULL)
  		tuple->next->prev = tuple;
  
  	return tuple;
  }
  
  char *
  tuple_find(pkg_tuple_t *head, const char *key)
  {
  	pkg_tuple_t *node;
  
  	foreach_list_entry(head, node)
  	{
  		if (!strcasecmp(node->key, key))
  			return node->value;
  	}
  
  	return NULL;
  }
  
  static char *
  strdup_parse(pkg_t *pkg, const char *value)
  {
  	char buf[BUFSIZ];
  	const char *ptr;
  	char *bptr = buf;
  
  	for (ptr = value; *ptr != '\0' && bptr - buf < BUFSIZ; ptr++)
  	{
  		if (*ptr != '$')
  			*bptr++ = *ptr;
  		else if (*(ptr + 1) == '{')
  		{
  			static char varname[BUFSIZ];
  			char *vptr = varname;
  			const char *pptr;
  			char *kv, *parsekv;
  
  			*vptr = '\0';
  
  			for (pptr = ptr + 2; *pptr != '\0'; pptr++)
  			{
  				if (*pptr != '}')
  					*vptr++ = *pptr;
  				else
  				{
  					*vptr = '\0';
  					break;
  				}
  			}
  
  			ptr += (pptr - ptr);
  			kv = tuple_find(pkg->vars, varname);
  
  			if (kv != NULL)
  			{
  				parsekv = strdup_parse(pkg, kv);
  
  				strncpy(bptr, parsekv, BUFSIZ - (bptr - buf));
  				bptr += strlen(parsekv);
  
  				free(parsekv);
  			}
  		}
  	}
  
  	*bptr = '\0';
  
  	return strdup(buf);
  }
  
  /*
   * parse_deplist(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 pkg_dependency_t *
  pkg_dependency_add(pkg_dependency_t *head, const char *package, const char *version, pkg_comparator_t compare)
  {
  	pkg_dependency_t *dep;
  
  	dep = calloc(sizeof(pkg_dependency_t), 1);
  	dep->package = strdup(package);
  
  	if (version != NULL)
  		dep->version = strdup(version);
  
  	dep->compare = compare;
  
  	dep->prev = head;
  	if (dep->prev != NULL)
  		dep->prev->next = dep;
  
  #if DEBUG_PARSE
  	fprintf(stderr, "--> %s %d %s\n", dep->package, dep->compare, dep->version);
  #endif
  
  	return dep;
  }
  
  #define MODULE_SEPARATOR(c) ((c) == ',' || isspace ((c)))
  #define OPERATOR_CHAR(c) ((c) == '<' || (c) == '>' || (c) == '!' || (c) == '=')
  
  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 */
  	foreach_list_entry(head, node)
  	{
  		if (node->next == NULL)
  			break;
  	}
  
  	node->next = tail;
  	tail->prev = node;
  
  	return head;
  }
  
  pkg_dependency_t *
  parse_deplist(pkg_t *pkg, const char *depends)
  {
  	parse_state_t state = OUTSIDE_MODULE;
  	parse_state_t last_state = OUTSIDE_MODULE;
  	pkg_dependency_t *deplist = NULL;
  	pkg_dependency_t *deplist_head = NULL;
  	pkg_comparator_t compare = PKG_ANY;
  	char buf[BUFSIZ];
  	char *kvdepends = strdup_parse(pkg, depends);
  	char *start = buf;
  	char *ptr = buf;
  	char *vstart = NULL;
  	char *package, *version;
  
  	strncpy(buf, kvdepends, BUFSIZ);
  	strncat(buf, " ", BUFSIZ);
  	free(kvdepends);
  
  	while (*ptr)
  	{
  		switch (state)
  		{
  		case OUTSIDE_MODULE:
  			if (!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 (MODULE_SEPARATOR(*sptr))
  					state = OUTSIDE_MODULE;
  				else if (OPERATOR_CHAR(*sptr))
  					state = BEFORE_OPERATOR;
  				else
  					state = OUTSIDE_MODULE;
  			}
  			else if (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 (MODULE_SEPARATOR(*iter))
  					iter++;
  
  				package = strndup(iter, ptr - iter);
  #if DEBUG_PARSE
  				fprintf(stderr, "Found package: %s\n", package);
  #endif
  				start = ptr;
  			}
  
  			if (state == OUTSIDE_MODULE)
  			{
  				deplist = pkg_dependency_add(deplist, package, NULL, compare);
  
  				if (deplist_head == NULL)
  					deplist_head = deplist;
  
  				if (package != NULL)
  				{
  					free(package);
  					package = NULL;
  				}
  
  				if (version != NULL)
  				{
  					free(version);
  					version = NULL;
  				}
  
  				compare = PKG_ANY;
  			}
  
  			break;
  
  		case BEFORE_OPERATOR:
  			if (OPERATOR_CHAR(*ptr))
  			{
  				switch(*ptr)
  				{
  				case '=':
  					compare = PKG_EQUAL;
  					break;
  				case '>':
  					compare = PKG_GREATER_THAN;
  					break;
  				case '<':
  					compare = PKG_LESS_THAN;
  					break;
  				case '!':
  					compare = PKG_NOT_EQUAL;
  					break;
  				default:
  					break;
  				}
  
  				state = INSIDE_OPERATOR;
  			}
  
  			break;
  
  		case INSIDE_OPERATOR:
  			if (!OPERATOR_CHAR(*ptr))
  				state = AFTER_OPERATOR;
  			else if (*ptr == '=')
  			{
  				switch(compare)
  				{
  				case PKG_LESS_THAN:
  					compare = PKG_LESS_THAN_EQUAL;
  					break;
  				case PKG_GREATER_THAN:
  					compare = PKG_GREATER_THAN_EQUAL;
  					break;
  				default:
  					break;
  				}
  			}
  
  			break;
  
  		case AFTER_OPERATOR:
  #if DEBUG_PARSE
  			fprintf(stderr, "Found op: %d\n", compare);
  #endif
  
  			if (!isspace(*ptr))
  			{
  				vstart = ptr;
  				state = INSIDE_VERSION;
  			}
  			break;
  
  		case INSIDE_VERSION:
  			if (MODULE_SEPARATOR(*ptr) || *(ptr + 1) == '\0')
  			{
  				version = strndup(vstart, (ptr - vstart));
  				state = OUTSIDE_MODULE;
  
  #if DEBUG_PARSE
  				fprintf(stderr, "Found version: %s\n", version);
  #endif
  				deplist = pkg_dependency_add(deplist, package, version, compare);
  
  				if (deplist_head == NULL)
  					deplist_head = deplist;
  
  				if (package != NULL)
  				{
  					free(package);
  					package = NULL;
  				}
  
  				if (version != NULL)
  				{
  					free(version);
  					version = NULL;
  				}
  
  				compare = PKG_ANY;
  			}
  
  			if (state == OUTSIDE_MODULE)
  				start = ptr;
  			break;
  		}
  
  		ptr++;
  	}
  
  	return deplist_head;
  }
  
  /*
   * parse_file(filename)
   *
   * Parse a .pc file into a pkg_t object structure.
   */
  pkg_t *
  parse_file(const char *filename, FILE *f)
  {
  	pkg_t *pkg;
  	char readbuf[BUFSIZ];
  
  	if (f == NULL)
  		return NULL;
  
  	pkg = calloc(sizeof(pkg_t), 1);
  	pkg->filename = strdup(filename);
  
  	while (fgets(readbuf, BUFSIZ, f) != NULL)
  	{
  		char op, *p, *key = NULL, *value = NULL;
  
  		readbuf[strlen(readbuf) - 1] = '\0';
  
  		p = readbuf;
  		while (*p && (isalpha(*p) || isdigit(*p) || *p == '_' || *p == '.'))
  			p++;
  
  		key = strndup(readbuf, p - readbuf);
  		if (!isalpha(*key) && !isdigit(*p))
  			goto cleanup;
  
  		while (*p && isspace(*p))
  			p++;
  
  		op = *p++;
  
  		while (*p && isspace(*p))
  			p++;
  
  		value = strdup(p);
  
  		switch (op)
  		{
  		case ':':
  			if (!strcasecmp(key, "Name"))
  				pkg->realname = strdup_parse(pkg, value);
  			else if (!strcasecmp(key, "Description"))
  				pkg->description = strdup_parse(pkg, value);
  			else if (!strcasecmp(key, "Version"))
  				pkg->version = strdup_parse(pkg, value);
  			else if (!strcasecmp(key, "CFLAGS"))
  				pkg->cflags = strdup_parse(pkg, value);
  			else if (!strcasecmp(key, "LIBS"))
  				pkg->libs = strdup_parse(pkg, value);
  			else if (!strcasecmp(key, "Requires"))
  				pkg->requires = parse_deplist(pkg, value);
  			else if (!strcasecmp(key, "Conflicts"))
  				pkg->conflicts = parse_deplist(pkg, value);
  			break;
  		case '=':
  			pkg->vars = tuple_add(pkg->vars, key, value);
  			break;
  		default:
  			break;
  		}
  
  cleanup:
  		if (key)
  			free(key);
  
  		if (value)
  			free(value);
  	}
  
  	fclose(f);
  	return pkg;
  }