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parse.c
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parse.c
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/*
* Copyright (C) 2006-2011 Tollef Fog Heen <[email protected]>
* Copyright (C) 2001, 2002, 2005-2006 Red Hat Inc.
* Copyright (C) 2010 Dan Nicholson <[email protected]>
*
* 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 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "parse.h"
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <sys/types.h>
gboolean parse_strict = TRUE;
gboolean define_prefix = ENABLE_DEFINE_PREFIX;
char *prefix_variable = "prefix";
#ifdef G_OS_WIN32
gboolean msvc_syntax = FALSE;
#endif
/**
* Read an entire line from a file into a buffer. Lines may
* be delimited with '\n', '\r', '\n\r', or '\r\n'. The delimiter
* is not written into the buffer. Text after a '#' character is treated as
* a comment and skipped. '\' can be used to escape a # character.
* '\' proceding a line delimiter combines adjacent lines. A '\' proceding
* any other character is ignored and written into the output buffer
* unmodified.
*
* Return value: %FALSE if the stream was already at an EOF character.
**/
static gboolean
read_one_line (FILE *stream, GString *str)
{
gboolean quoted = FALSE;
gboolean comment = FALSE;
int n_read = 0;
g_string_truncate (str, 0);
while (1)
{
int c;
c = getc (stream);
if (c == EOF)
{
if (quoted)
g_string_append_c (str, '\\');
goto done;
}
else
n_read++;
if (quoted)
{
quoted = FALSE;
switch (c)
{
case '#':
g_string_append_c (str, '#');
break;
case '\r':
case '\n':
{
int next_c = getc (stream);
if (!(c == EOF ||
(c == '\r' && next_c == '\n') ||
(c == '\n' && next_c == '\r')))
ungetc (next_c, stream);
break;
}
default:
g_string_append_c (str, '\\');
g_string_append_c (str, c);
}
}
else
{
switch (c)
{
case '#':
comment = TRUE;
break;
case '\\':
if (!comment)
quoted = TRUE;
break;
case '\n':
{
int next_c = getc (stream);
if (!(c == EOF ||
(c == '\r' && next_c == '\n') ||
(c == '\n' && next_c == '\r')))
ungetc (next_c, stream);
goto done;
}
default:
if (!comment)
g_string_append_c (str, c);
}
}
}
done:
return n_read > 0;
}
static char *
trim_string (const char *str)
{
int len;
g_return_val_if_fail (str != NULL, NULL);
while (*str && isspace ((guchar)*str))
str++;
len = strlen (str);
while (len > 0 && isspace ((guchar)str[len-1]))
len--;
return g_strndup (str, len);
}
static char *
trim_and_sub (Package *pkg, const char *str, const char *path)
{
char *trimmed;
GString *subst;
char *p;
trimmed = trim_string (str);
subst = g_string_new ("");
p = trimmed;
while (*p)
{
if (p[0] == '$' &&
p[1] == '$')
{
/* escaped $ */
g_string_append_c (subst, '$');
p += 2;
}
else if (p[0] == '$' &&
p[1] == '{')
{
/* variable */
char *var_start;
char *varname;
char *varval;
var_start = &p[2];
/* Get up to close brace. */
while (*p && *p != '}')
++p;
varname = g_strndup (var_start, p - var_start);
++p; /* past brace */
varval = package_get_var (pkg, varname);
if (varval == NULL)
{
verbose_error ("Variable '%s' not defined in '%s'\n",
varname, path);
if (parse_strict)
exit (1);
}
g_free (varname);
g_string_append (subst, varval);
g_free (varval);
}
else
{
g_string_append_c (subst, *p);
++p;
}
}
g_free (trimmed);
p = subst->str;
g_string_free (subst, FALSE);
return p;
}
static void
parse_name (Package *pkg, const char *str, const char *path)
{
if (pkg->name)
{
verbose_error ("Name field occurs twice in '%s'\n", path);
if (parse_strict)
exit (1);
else
return;
}
pkg->name = trim_and_sub (pkg, str, path);
}
static void
parse_version (Package *pkg, const char *str, const char *path)
{
if (pkg->version)
{
verbose_error ("Version field occurs twice in '%s'\n", path);
if (parse_strict)
exit (1);
else
return;
}
pkg->version = trim_and_sub (pkg, str, path);
}
static void
parse_description (Package *pkg, const char *str, const char *path)
{
if (pkg->description)
{
verbose_error ("Description field occurs twice in '%s'\n", path);
if (parse_strict)
exit (1);
else
return;
}
pkg->description = trim_and_sub (pkg, str, path);
}
#define MODULE_SEPARATOR(c) ((c) == ',' || isspace ((guchar)(c)))
#define OPERATOR_CHAR(c) ((c) == '<' || (c) == '>' || (c) == '!' || (c) == '=')
/* A module list is a list of modules with optional version specification,
* separated by commas and/or spaces. Commas are treated just like whitespace,
* in order to allow stuff like: Requires: @FRIBIDI_PC@, glib, gmodule
* where @FRIBIDI_PC@ gets substituted to nothing or to 'fribidi'
*/
typedef enum
{
/* put numbers to help interpret lame debug spew ;-) */
OUTSIDE_MODULE = 0,
IN_MODULE_NAME = 1,
BEFORE_OPERATOR = 2,
IN_OPERATOR = 3,
AFTER_OPERATOR = 4,
IN_MODULE_VERSION = 5
} ModuleSplitState;
#define PARSE_SPEW 0
static GList *
split_module_list (const char *str, const char *path)
{
GList *retval = NULL;
const char *p;
const char *start;
ModuleSplitState state = OUTSIDE_MODULE;
ModuleSplitState last_state = OUTSIDE_MODULE;
/* fprintf (stderr, "Parsing: '%s'\n", str); */
start = str;
p = str;
while (*p)
{
#if PARSE_SPEW
fprintf (stderr, "p: %c state: %d last_state: %d\n", *p, state, last_state);
#endif
switch (state)
{
case OUTSIDE_MODULE:
if (!MODULE_SEPARATOR (*p))
state = IN_MODULE_NAME;
break;
case IN_MODULE_NAME:
if (isspace ((guchar)*p))
{
/* Need to look ahead to determine next state */
const char *s = p;
while (*s && isspace ((guchar)*s))
++s;
if (*s == '\0')
state = OUTSIDE_MODULE;
else if (MODULE_SEPARATOR (*s))
state = OUTSIDE_MODULE;
else if (OPERATOR_CHAR (*s))
state = BEFORE_OPERATOR;
else
state = OUTSIDE_MODULE;
}
else if (MODULE_SEPARATOR (*p))
state = OUTSIDE_MODULE; /* comma precludes any operators */
break;
case BEFORE_OPERATOR:
/* We know an operator is coming up here due to lookahead from
* IN_MODULE_NAME
*/
if (isspace ((guchar)*p))
; /* no change */
else if (OPERATOR_CHAR (*p))
state = IN_OPERATOR;
else
g_assert_not_reached ();
break;
case IN_OPERATOR:
if (!OPERATOR_CHAR (*p))
state = AFTER_OPERATOR;
break;
case AFTER_OPERATOR:
if (!isspace ((guchar)*p))
state = IN_MODULE_VERSION;
break;
case IN_MODULE_VERSION:
if (MODULE_SEPARATOR (*p))
state = OUTSIDE_MODULE;
break;
default:
g_assert_not_reached ();
}
if (state == OUTSIDE_MODULE &&
last_state != OUTSIDE_MODULE)
{
/* We left a module */
char *module = g_strndup (start, p - start);
retval = g_list_prepend (retval, module);
#if PARSE_SPEW
fprintf (stderr, "found module: '%s'\n", module);
#endif
/* reset start */
start = p;
}
last_state = state;
++p;
}
if (p != start)
{
/* get the last module */
char *module = g_strndup (start, p - start);
retval = g_list_prepend (retval, module);
#if PARSE_SPEW
fprintf (stderr, "found module: '%s'\n", module);
#endif
}
retval = g_list_reverse (retval);
return retval;
}
GList *
parse_module_list (Package *pkg, const char *str, const char *path)
{
GList *split;
GList *iter;
GList *retval = NULL;
split = split_module_list (str, path);
for (iter = split; iter != NULL; iter = g_list_next (iter))
{
RequiredVersion *ver;
char *p;
char *start;
p = iter->data;
ver = g_new0 (RequiredVersion, 1);
ver->comparison = ALWAYS_MATCH;
ver->owner = pkg;
retval = g_list_prepend (retval, ver);
while (*p && MODULE_SEPARATOR (*p))
++p;
start = p;
while (*p && !isspace ((guchar)*p))
++p;
while (*p && MODULE_SEPARATOR (*p))
{
*p = '\0';
++p;
}
if (*start == '\0')
{
verbose_error ("Empty package name in Requires or Conflicts in file '%s'\n", path);
if (parse_strict)
exit (1);
else
continue;
}
ver->name = g_strdup (start);
start = p;
while (*p && !isspace ((guchar)*p))
++p;
while (*p && isspace ((guchar)*p))
{
*p = '\0';
++p;
}
if (*start != '\0')
{
if (strcmp (start, "=") == 0)
ver->comparison = EQUAL;
else if (strcmp (start, ">=") == 0)
ver->comparison = GREATER_THAN_EQUAL;
else if (strcmp (start, "<=") == 0)
ver->comparison = LESS_THAN_EQUAL;
else if (strcmp (start, ">") == 0)
ver->comparison = GREATER_THAN;
else if (strcmp (start, "<") == 0)
ver->comparison = LESS_THAN;
else if (strcmp (start, "!=") == 0)
ver->comparison = NOT_EQUAL;
else
{
verbose_error ("Unknown version comparison operator '%s' after "
"package name '%s' in file '%s'\n", start,
ver->name, path);
if (parse_strict)
exit (1);
else
continue;
}
}
start = p;
while (*p && !MODULE_SEPARATOR (*p))
++p;
while (*p && MODULE_SEPARATOR (*p))
{
*p = '\0';
++p;
}
if (ver->comparison != ALWAYS_MATCH && *start == '\0')
{
verbose_error ("Comparison operator but no version after package "
"name '%s' in file '%s'\n", ver->name, path);
if (parse_strict)
exit (1);
else
{
ver->version = g_strdup ("0");
continue;
}
}
if (*start != '\0')
{
ver->version = g_strdup (start);
}
g_assert (ver->name);
}
g_list_foreach (split, (GFunc) g_free, NULL);
g_list_free (split);
retval = g_list_reverse (retval);
return retval;
}
static void
parse_requires (Package *pkg, const char *str, const char *path)
{
char *trimmed;
if (pkg->requires)
{
verbose_error ("Requires field occurs twice in '%s'\n", path);
if (parse_strict)
exit (1);
else
return;
}
trimmed = trim_and_sub (pkg, str, path);
pkg->requires_entries = parse_module_list (pkg, trimmed, path);
g_free (trimmed);
}
static void
parse_requires_private (Package *pkg, const char *str, const char *path)
{
char *trimmed;
if (pkg->requires_private)
{
verbose_error ("Requires.private field occurs twice in '%s'\n", path);
if (parse_strict)
exit (1);
else
return;
}
trimmed = trim_and_sub (pkg, str, path);
pkg->requires_private_entries = parse_module_list (pkg, trimmed, path);
g_free (trimmed);
}
static void
parse_conflicts (Package *pkg, const char *str, const char *path)
{
char *trimmed;
if (pkg->conflicts)
{
verbose_error ("Conflicts field occurs twice in '%s'\n", path);
if (parse_strict)
exit (1);
else
return;
}
trimmed = trim_and_sub (pkg, str, path);
pkg->conflicts = parse_module_list (pkg, trimmed, path);
g_free (trimmed);
}
static char *strdup_escape_shell(const char *s)
{
size_t r_s = strlen(s)+10, c = 0;
char *r = g_malloc(r_s);
while (s[0]) {
if ((s[0] < '$') ||
(s[0] > '$' && s[0] < '(') ||
(s[0] > ')' && s[0] < '+') ||
(s[0] > ':' && s[0] < '=') ||
(s[0] > '=' && s[0] < '@') ||
(s[0] > 'Z' && s[0] < '^') ||
(s[0] == '`') ||
(s[0] > 'z' && s[0] < '~') ||
(s[0] > '~')) {
r[c] = '\\';
c++;
}
r[c] = *s;
c++;
if (c+2 >= r_s) {
r_s *= 2;
r = g_realloc(r, r_s);
}
s++;
}
r[c] = 0;
return r;
}
static void _do_parse_libs (Package *pkg, int argc, char **argv)
{
int i;
#ifdef G_OS_WIN32
char *L_flag = (msvc_syntax ? "/libpath:" : "-L");
char *l_flag = (msvc_syntax ? "" : "-l");
char *lib_suffix = (msvc_syntax ? ".lib" : "");
#else
char *L_flag = "-L";
char *l_flag = "-l";
char *lib_suffix = "";
#endif
i = 0;
while (i < argc)
{
Flag *flag = g_new (Flag, 1);
char *tmp = trim_string (argv[i]);
char *arg = strdup_escape_shell(tmp);
char *p;
p = arg;
g_free(tmp);
if (p[0] == '-' &&
p[1] == 'l' &&
/* -lib: is used by the C# compiler for libs; it's not an -l
flag. */
(strncmp(p, "-lib:", 5) != 0))
{
p += 2;
while (*p && isspace ((guchar)*p))
++p;
flag->type = LIBS_l;
flag->arg = g_strconcat (l_flag, p, lib_suffix, NULL);
pkg->libs = g_list_prepend (pkg->libs, flag);
}
else if (p[0] == '-' &&
p[1] == 'L')
{
p += 2;
while (*p && isspace ((guchar)*p))
++p;
flag->type = LIBS_L;
flag->arg = g_strconcat (L_flag, p, NULL);
pkg->libs = g_list_prepend (pkg->libs, flag);
}
else if ((strcmp("-framework", p) == 0 ||
strcmp("-Wl,-framework", p) == 0) &&
i+1 < argc)
{
/* Mac OS X has a -framework Foo which is really one option,
* so we join those to avoid having -framework Foo
* -framework Bar being changed into -framework Foo Bar
* later
*/
gchar *framework, *tmp = trim_string (argv[i+1]);
framework = strdup_escape_shell(tmp);
flag->type = LIBS_OTHER;
flag->arg = g_strconcat (arg, " ", framework, NULL);
pkg->libs = g_list_prepend (pkg->libs, flag);
i++;
g_free (framework);
g_free (tmp);
}
else if (*arg != '\0')
{
flag->type = LIBS_OTHER;
flag->arg = g_strdup (arg);
pkg->libs = g_list_prepend (pkg->libs, flag);
}
else
/* flag wasn't used */
g_free (flag);
g_free (arg);
++i;
}
}
static void
parse_libs (Package *pkg, const char *str, const char *path)
{
/* Strip out -l and -L flags, put them in a separate list. */
char *trimmed;
char **argv = NULL;
int argc = 0;
GError *error = NULL;
if (pkg->libs_num > 0)
{
verbose_error ("Libs field occurs twice in '%s'\n", path);
if (parse_strict)
exit (1);
else
return;
}
trimmed = trim_and_sub (pkg, str, path);
if (trimmed && *trimmed &&
!g_shell_parse_argv (trimmed, &argc, &argv, &error))
{
verbose_error ("Couldn't parse Libs field into an argument vector: %s\n",
error ? error->message : "unknown");
if (parse_strict)
exit (1);
else
{
g_free (trimmed);
return;
}
}
_do_parse_libs(pkg, argc, argv);
g_free (trimmed);
g_strfreev (argv);
pkg->libs_num++;
}
static void
parse_libs_private (Package *pkg, const char *str, const char *path)
{
/*
List of private libraries. Private libraries are libraries which
are needed in the case of static linking or on platforms not
supporting inter-library dependencies. They are not supposed to
be used for libraries which are exposed through the library in
question. An example of an exposed library is GTK+ exposing Glib.
A common example of a private library is libm.
Generally, if include another library's headers in your own, it's
a public dependency and not a private one.
*/
char *trimmed;
char **argv = NULL;
int argc = 0;
GError *error = NULL;
if (pkg->libs_private_num > 0)
{
verbose_error ("Libs.private field occurs twice in '%s'\n", path);
if (parse_strict)
exit (1);
else
return;
}
trimmed = trim_and_sub (pkg, str, path);
if (trimmed && *trimmed &&
!g_shell_parse_argv (trimmed, &argc, &argv, &error))
{
verbose_error ("Couldn't parse Libs.private field into an argument vector: %s\n",
error ? error->message : "unknown");
if (parse_strict)
exit (1);
else
{
g_free (trimmed);
return;
}
}
_do_parse_libs(pkg, argc, argv);
g_strfreev (argv);
g_free (trimmed);
pkg->libs_private_num++;
}
static void
parse_cflags (Package *pkg, const char *str, const char *path)
{
/* Strip out -I flags, put them in a separate list. */
char *trimmed;
char **argv = NULL;
int argc = 0;
GError *error = NULL;
int i;
if (pkg->cflags)
{
verbose_error ("Cflags field occurs twice in '%s'\n", path);
if (parse_strict)
exit (1);
else
return;
}
trimmed = trim_and_sub (pkg, str, path);
if (trimmed && *trimmed &&
!g_shell_parse_argv (trimmed, &argc, &argv, &error))
{
verbose_error ("Couldn't parse Cflags field into an argument vector: %s\n",
error ? error->message : "unknown");
if (parse_strict)
exit (1);
else
{
g_free (trimmed);
return;
}
}
i = 0;
while (i < argc)
{
Flag *flag = g_new (Flag, 1);
char *tmp = trim_string (argv[i]);
char *arg = strdup_escape_shell(tmp);
char *p = arg;
g_free(tmp);
if (p[0] == '-' &&
p[1] == 'I')
{
p += 2;
while (*p && isspace ((guchar)*p))
++p;
flag->type = CFLAGS_I;
flag->arg = g_strconcat ("-I", p, NULL);
pkg->cflags = g_list_prepend (pkg->cflags, flag);
}
else if ((strcmp ("-idirafter", arg) == 0 ||
strcmp ("-isystem", arg) == 0) &&
i+1 < argc)
{
char *option, *tmp;
tmp = trim_string (argv[i+1]);
option = strdup_escape_shell (tmp);
flag->type = CFLAGS_OTHER;
flag->arg = g_strconcat (arg, " ", option, NULL);
pkg->cflags = g_list_prepend (pkg->cflags, flag);
i++;
g_free (option);
g_free (tmp);
}
else if (*arg != '\0')
{
flag->type = CFLAGS_OTHER;
flag->arg = g_strdup (arg);
pkg->cflags = g_list_prepend (pkg->cflags, flag);
}
else
/* flag wasn't used */
g_free (flag);
g_free (arg);
++i;
}
g_strfreev (argv);
g_free (trimmed);
}
static void
parse_url (Package *pkg, const char *str, const char *path)
{
if (pkg->url != NULL)
{
verbose_error ("URL field occurs twice in '%s'\n", path);
if (parse_strict)
exit (1);
else
return;
}
pkg->url = trim_and_sub (pkg, str, path);
}
static void
parse_line (Package *pkg, const char *untrimmed, const char *path,
gboolean ignore_requires, gboolean ignore_private_libs,
gboolean ignore_requires_private)
{
char *str;
char *p;
char *tag;
debug_spew (" line>%s\n", untrimmed);
str = trim_string (untrimmed);
if (*str == '\0') /* empty line */
{
g_free(str);
return;
}
p = str;
/* Get first word */
while ((*p >= 'A' && *p <= 'Z') ||
(*p >= 'a' && *p <= 'z') ||
(*p >= '0' && *p <= '9') ||
*p == '_' || *p == '.')
p++;
tag = g_strndup (str, p - str);
while (*p && isspace ((guchar)*p))
++p;
if (*p == ':')
{
/* keyword */
++p;
while (*p && isspace ((guchar)*p))
++p;
if (strcmp (tag, "Name") == 0)
parse_name (pkg, p, path);
else if (strcmp (tag, "Description") == 0)
parse_description (pkg, p, path);
else if (strcmp (tag, "Version") == 0)
parse_version (pkg, p, path);
else if (strcmp (tag, "Requires.private") == 0)
{
if (!ignore_requires_private)
parse_requires_private (pkg, p, path);
}
else if (strcmp (tag, "Requires") == 0)
{
if (ignore_requires == FALSE)
parse_requires (pkg, p, path);
else
goto cleanup;
}
else if ((strcmp (tag, "Libs.private") == 0) &&
ignore_private_libs == FALSE)
parse_libs_private (pkg, p, path);
else if (strcmp (tag, "Libs") == 0)
parse_libs (pkg, p, path);
else if (strcmp (tag, "Cflags") == 0 ||
strcmp (tag, "CFlags") == 0)
parse_cflags (pkg, p, path);
else if (strcmp (tag, "Conflicts") == 0)
parse_conflicts (pkg, p, path);
else if (strcmp (tag, "URL") == 0)
parse_url (pkg, p, path);
else
{
/* we don't error out on unknown keywords because they may
* represent additions to the .pc file format from future
* versions of pkg-config. We do make a note of them in the
* debug spew though, in order to help catch mistakes in .pc
* files. */
debug_spew ("Unknown keyword '%s' in '%s'\n",
tag, path);
}
}
else if (*p == '=')
{
/* variable */
char *varname;
char *varval;
++p;
while (*p && isspace ((guchar)*p))
++p;
if (define_prefix && strcmp (tag, prefix_variable) == 0)
{
/* This is the prefix variable. Try to guesstimate a value for it
* for this package from the location of the .pc file.
*/