1 /* server-help.h - Helper functions for writing Assuan servers.
2 * Copyright (C) 2003, 2009, 2010 g10 Code GmbH
4 * This file is part of GnuPG.
6 * This file is free software; you can redistribute it and/or modify
7 * it under the terms of either
9 * - the GNU Lesser General Public License as published by the Free
10 * Software Foundation; either version 3 of the License, or (at
11 * your option) any later version.
15 * - the GNU General Public License as published by the Free
16 * Software Foundation; either version 2 of the License, or (at
17 * your option) any later version.
19 * or both in parallel, as here.
21 * This file is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, see <https://www.gnu.org/licenses/>.
34 #include "server-help.h"
37 static GPGRT_INLINE gpg_error_t
40 return gpg_err_make (default_errsource, (e));
43 static GPGRT_INLINE gpg_error_t
44 my_error_from_syserror (void)
46 return gpg_err_make (default_errsource, gpg_err_code_from_syserror ());
50 /* Skip over options in LINE.
52 Blanks after the options are also removed. Options are indicated
53 by two leading dashes followed by a string consisting of non-space
54 characters. The special option "--" indicates an explicit end of
55 options; all what follows will not be considered an option. The
56 first no-option string also indicates the end of option parsing. */
58 skip_options (const char *line)
62 while (*line == '-' && line[1] == '-')
64 while (*line && !spacep (line))
73 /* Check whether the option NAME appears in LINE. */
75 has_option (const char *line, const char *name)
78 int n = strlen (name);
80 s = strstr (line, name);
81 if (s && s >= skip_options (line))
83 return (s && (s == line || spacep (s-1)) && (!s[n] || spacep (s+n)));
87 /* Same as has_option but only considers options at the begin of the
88 line. This is useful for commands which allow arbitrary strings on
91 has_leading_option (const char *line, const char *name)
96 if (name[0] != '-' || name[1] != '-' || !name[2] || spacep (name+2))
99 while ( *line == '-' && line[1] == '-' )
102 while (*line && !spacep (line))
104 if (n == (line - s) && !strncmp (s, name, n))
106 while (spacep (line))
113 /* Same as has_option but does only test for the name of the option
114 and ignores an argument, i.e. with NAME being "--hash" it would
115 return a pointer for "--hash" as well as for "--hash=foo". If
116 there is no such option NULL is returned. The pointer returned
117 points right behind the option name, this may be an equal sign, Nul
120 has_option_name (const char *line, const char *name)
123 int n = strlen (name);
125 s = strstr (line, name);
126 return (s && (s == line || spacep (s-1))
127 && (!s[n] || spacep (s+n) || s[n] == '=')) ? (s+n) : NULL;
131 /* Parse an option with the format "--NAME=VALUE" which must occur in
132 * LINE before a double-dash. LINE is written to but not modified by
133 * this function. If the option is found and has a value the value is
134 * stored as a malloced string at R_VALUE. If the option was not
135 * found or an error occurred NULL is stored there. Note that
136 * currently the value must be a string without any space; we may
137 * eventually update this function to allow for a quoted value. */
139 get_option_value (char *line, const char *name, char **r_value)
146 p = (char*)has_option_name (line, name);
147 if (!p || p >= skip_options (line))
150 if (*p != '=' || !p[1] || spacep (p+1))
151 return my_error (GPG_ERR_INV_ARG);
153 for (pend = p; *pend && !spacep (pend); pend++)
157 *r_value = xtrystrdup (p);
160 return my_error_from_syserror ();
165 /* Return a pointer to the argument of the option with NAME. If such
166 an option is not given, NULL is returned. */
168 option_value (const char *line, const char *name)
171 int n = strlen (name);
173 s = strstr (line, name);
174 if (s && s >= skip_options (line))
176 if (s && (s == line || spacep (s-1))
177 && s[n] && (spacep (s+n) || s[n] == '='))
180 s += strspn (s, " ");
181 if (*s && !spacep(s))