diff options
Diffstat (limited to 'src/util')
| -rw-r--r-- | src/util/Makefile.am | 1 | ||||
| -rw-r--r-- | src/util/lang.c | 71 |
2 files changed, 72 insertions, 0 deletions
diff --git a/src/util/Makefile.am b/src/util/Makefile.am index 3831dd3f..c25e5700 100644 --- a/src/util/Makefile.am +++ b/src/util/Makefile.am @@ -38,6 +38,7 @@ libtalerutil_la_SOURCES = \ crypto.c \ crypto_wire.c \ getopt.c \ + lang.c \ mhd.c \ payto.c \ taler_error_codes.c \ diff --git a/src/util/lang.c b/src/util/lang.c new file mode 100644 index 00000000..3f6a4291 --- /dev/null +++ b/src/util/lang.c @@ -0,0 +1,71 @@ +/* + This file is part of TALER + Copyright (C) 2020 Taler Systems SA + + TALER 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 3, or (at your option) any later version. + + TALER 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 + TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> +*/ +/** + * @file lang.c + * @brief Utility functions for parsing and matching RFC 7231 language strings. + * @author Christian Grothoff + */ +#include "platform.h" +#include "taler_util.h" + + +/** + * Check if @a lang matches the @a language_pattern, and if so with + * which preference. + * See also: https://tools.ietf.org/html/rfc7231#section-5.3.1 + * + * @param language_pattern a language preferences string + * like "fr-CH, fr;q=0.9, en;q=0.8, *;q=0.1" + * @param lang the 2-digit language to match + * @return q-weight given for @a lang in @a language_pattern, 1.0 if no weights are given; + * 0 if @a lang is not in @a language_pattern + */ +double +TALER_language_matches (const char *language_pattern, + const char *lang) +{ + char *p = GNUNET_strdup (language_pattern); + char *sptr; + double r = 0.0; + + for (char *tok = strtok_r (p, ",", &sptr); + NULL != tok; + tok = strtok_r (NULL, ",", &sptr)) + { + char *sptr2; + char *lp = strtok_r (tok, ";", &sptr2); + char *qp = strtok_r (NULL, ";", &sptr2); + double q = 1.0; + + while (isspace ((int) *lp)) + lp++; + if (NULL != qp) + while (isspace ((int) *qp)) + qp++; + GNUNET_break_op ( (NULL == qp) || + (1 == sscanf (qp, + "q=%lf", + &q)) ); + if (0 == strcasecmp (lang, + lp)) + r = GNUNET_MAX (r, q); + } + GNUNET_free (p); + return r; +} + + +/* end of lang.c */ |