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-rw-r--r--common/server-help.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/common/server-help.c b/common/server-help.c
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+++ b/common/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;
+}