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server-help.c
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/* server-help.h - Helper functions for writing Assuan servers.
* Copyright (C) 2003, 2009, 2010 g10 Code GmbH
*
* This file is part of GnuPG.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of either
*
* - the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* or
*
* - 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.
*
* or both in parallel, as here.
*
* This file 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, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <string.h>
#include "util.h"
#include "server-help.h"
static GPGRT_INLINE gpg_error_t
my_error (int e)
{
return gpg_err_make (default_errsource, (e));
}
static GPGRT_INLINE gpg_error_t
my_error_from_syserror (void)
{
return gpg_err_make (default_errsource, gpg_err_code_from_syserror ());
}
/* Skip over options in LINE.
Blanks after the options are also removed. Options are indicated
by two leading dashes followed by a string consisting of non-space
characters. The special option "--" indicates an explicit end of
options; all what follows will not be considered an option. The
first no-option string also indicates the end of option parsing. */
char *
skip_options (const char *line)
{
while (spacep (line))
line++;
while (*line == '-' && line[1] == '-')
{
while (*line && !spacep (line))
line++;
while (spacep (line))
line++;
}
return (char*) line;
}
/* Check whether the option NAME appears in LINE. */
int
has_option (const char *line, const char *name)
{
const char *s;
int n = strlen (name);
s = strstr (line, name);
if (s && s >= skip_options (line))
return 0;
return (s && (s == line || spacep (s-1)) && (!s[n] || spacep (s+n)));
}
/* Same as has_option but only considers options at the begin of the
line. This is useful for commands which allow arbitrary strings on
the line. */
int
has_leading_option (const char *line, const char *name)
{
const char *s;
int n;
if (name[0] != '-' || name[1] != '-' || !name[2] || spacep (name+2))
return 0;
n = strlen (name);
while ( *line == '-' && line[1] == '-' )
{
s = line;
while (*line && !spacep (line))
line++;
if (n == (line - s) && !strncmp (s, name, n))
return 1;
while (spacep (line))
line++;
}
return 0;
}
/* Same as has_option but does only test for the name of the option
and ignores an argument, i.e. with NAME being "--hash" it would
return a pointer for "--hash" as well as for "--hash=foo". If
there is no such option NULL is returned. The pointer returned
points right behind the option name, this may be an equal sign, Nul
or a space. */
const char *
has_option_name (const char *line, const char *name)
{
const char *s;
int n = strlen (name);
s = strstr (line, name);
return (s && (s == line || spacep (s-1))
&& (!s[n] || spacep (s+n) || s[n] == '=')) ? (s+n) : NULL;
}
/* Parse an option with the format "--NAME=VALUE" which must occur in
* LINE before a double-dash. LINE is written to but not modified by
* this function. If the option is found and has a value the value is
* stored as a malloced string at R_VALUE. If the option was not
* found or an error occurred NULL is stored there. Note that
* currently the value must be a string without any space; we may
* eventually update this function to allow for a quoted value. */
gpg_error_t
get_option_value (char *line, const char *name, char **r_value)
{
char *p, *pend;
int c;
*r_value = NULL;
p = (char*)has_option_name (line, name);
if (!p || p >= skip_options (line))
return 0;
if (*p != '=' || !p[1] || spacep (p+1))
return my_error (GPG_ERR_INV_ARG);
p++;
for (pend = p; *pend && !spacep (pend); pend++)
;
c = *pend;
*pend = 0;
*r_value = xtrystrdup (p);
*pend = c;
if (!p)
return my_error_from_syserror ();
return 0;
}
/* Return a pointer to the argument of the option with NAME. If such
an option is not given, NULL is returned. */
char *
option_value (const char *line, const char *name)
{
char *s;
int n = strlen (name);
s = strstr (line, name);
if (s && s >= skip_options (line))
return NULL;
if (s && (s == line || spacep (s-1))
&& s[n] && (spacep (s+n) || s[n] == '='))
{
s += n + 1;
s += strspn (s, " ");
if (*s && !spacep(s))
return s;
}
return NULL;
}

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