mirror of git://git.gnupg.org/gnupg.git
138 lines
3.7 KiB
C
138 lines
3.7 KiB
C
/* server-help.h - Helper functions for writing Assuan servers.
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* Copyright (C) 2003, 2009, 2010 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <string.h>
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#include "server-help.h"
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#include "util.h"
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/* Skip over options in LINE.
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Blanks after the options are also removed. Options are indicated
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by two leading dashes followed by a string consisting of non-space
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characters. The special option "--" indicates an explicit end of
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options; all what follows will not be considered an option. The
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first no-option string also indicates the end of option parsing. */
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char *
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skip_options (const char *line)
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{
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while (spacep (line))
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line++;
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while (*line == '-' && line[1] == '-')
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{
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while (*line && !spacep (line))
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line++;
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while (spacep (line))
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line++;
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}
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return (char*) line;
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}
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/* Check whether the option NAME appears in LINE. */
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int
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has_option (const char *line, const char *name)
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{
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const char *s;
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int n = strlen (name);
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s = strstr (line, name);
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if (s && s >= skip_options (line))
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return 0;
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return (s && (s == line || spacep (s-1)) && (!s[n] || spacep (s+n)));
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}
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/* Same as has_option but only considers options at the begin of the
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line. This is useful for commands which allow arbitrary strings on
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the line. */
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int
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has_leading_option (const char *line, const char *name)
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{
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const char *s;
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int n;
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if (name[0] != '-' || name[1] != '-' || !name[2] || spacep (name+2))
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return 0;
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n = strlen (name);
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while ( *line == '-' && line[1] == '-' )
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{
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s = line;
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while (*line && !spacep (line))
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line++;
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if (n == (line - s) && !strncmp (s, name, n))
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return 1;
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while (spacep (line))
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line++;
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}
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return 0;
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}
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/* Same as has_option but does only test for the name of the option
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and ignores an argument, i.e. with NAME being "--hash" it would
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return a pointer for "--hash" as well as for "--hash=foo". If
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there is no such option NULL is returned. The pointer returned
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points right behind the option name, this may be an equal sign, Nul
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or a space. */
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const char *
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has_option_name (const char *line, const char *name)
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{
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const char *s;
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int n = strlen (name);
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s = strstr (line, name);
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return (s && (s == line || spacep (s-1))
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&& (!s[n] || spacep (s+n) || s[n] == '=')) ? (s+n) : NULL;
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}
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/* Return a pointer to the argument of the option with NAME. If such
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an option is not given, NULL is returned. */
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char *
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option_value (const char *line, const char *name)
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{
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char *s;
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int n = strlen (name);
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s = strstr (line, name);
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if (s && s >= skip_options (line))
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return NULL;
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if (s && (s == line || spacep (s-1))
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&& s[n] && (spacep (s+n) || s[n] == '='))
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{
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s += n + 1;
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s += strspn (s, " ");
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if (*s && !spacep(s))
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return s;
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}
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return NULL;
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}
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