diff options
Diffstat (limited to 'iconv/gconv_parseconfdir.h')
| -rw-r--r-- | iconv/gconv_parseconfdir.h | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/iconv/gconv_parseconfdir.h b/iconv/gconv_parseconfdir.h new file mode 100644 index 0000000..3d4d58d --- /dev/null +++ b/iconv/gconv_parseconfdir.h @@ -0,0 +1,161 @@ +/* Handle configuration data. + Copyright (C) 2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <dirent.h> +#include <libc-symbols.h> +#include <locale.h> +#include <sys/types.h> + +#if IS_IN (libc) +# include <libio/libioP.h> +# define __getdelim(line, len, c, fp) _IO_getdelim (line, len, c, fp) + +# undef isspace +# define isspace(__c) __isspace_l ((__c), _nl_C_locobj_ptr) +# define asprintf __asprintf +# define opendir __opendir +# define readdir __readdir +# define closedir __closedir +# define mempcpy __mempcpy +#endif + +/* Name of the file containing the module information in the directories + along the path. */ +static const char gconv_conf_filename[] = "gconv-modules"; +static const char gconv_conf_dirname[] = "gconv-modules.d"; + +static void add_alias (char *); +static void add_module (char *, const char *, size_t, int); + +/* Read the next configuration file. */ +static bool +read_conf_file (const char *filename, const char *directory, size_t dir_len) +{ + /* Note the file is opened with cancellation in the I/O functions + disabled. */ + FILE *fp = fopen (filename, "rce"); + char *line = NULL; + size_t line_len = 0; + static int modcounter; + + /* Don't complain if a file is not present or readable, simply silently + ignore it. */ + if (fp == NULL) + return false; + + /* No threads reading from this stream. */ + __fsetlocking (fp, FSETLOCKING_BYCALLER); + + /* Process the known entries of the file. Comments start with `#' and + end with the end of the line. Empty lines are ignored. */ + while (!__feof_unlocked (fp)) + { + char *rp, *endp, *word; + ssize_t n = __getdelim (&line, &line_len, '\n', fp); + if (n < 0) + /* An error occurred. */ + break; + + rp = line; + /* Terminate the line (excluding comments or newline) by an NUL byte + to simplify the following code. */ + endp = strchr (rp, '#'); + if (endp != NULL) + *endp = '\0'; + else + if (rp[n - 1] == '\n') + rp[n - 1] = '\0'; + + while (isspace (*rp)) + ++rp; + + /* If this is an empty line go on with the next one. */ + if (rp == endp) + continue; + + word = rp; + while (*rp != '\0' && !isspace (*rp)) + ++rp; + + if (rp - word == sizeof ("alias") - 1 + && memcmp (word, "alias", sizeof ("alias") - 1) == 0) + add_alias (rp); + else if (rp - word == sizeof ("module") - 1 + && memcmp (word, "module", sizeof ("module") - 1) == 0) + add_module (rp, directory, dir_len, modcounter++); + /* else */ + /* Otherwise ignore the line. */ + } + + free (line); + + fclose (fp); + return true; +} + +static __always_inline bool +gconv_parseconfdir (const char *dir, size_t dir_len) +{ + /* No slash needs to be inserted between dir and gconv_conf_filename; + dir already ends in a slash. */ + char *buf = malloc (dir_len + sizeof (gconv_conf_dirname)); + bool found = false; + + if (buf == NULL) + return false; + + char *cp = mempcpy (mempcpy (buf, dir, dir_len), gconv_conf_filename, + sizeof (gconv_conf_filename)); + + /* Read the gconv-modules configuration file first. */ + found = read_conf_file (buf, dir, dir_len); + + /* Next, see if there is a gconv-modules.d directory containing + configuration files and if it is non-empty. */ + cp--; + cp[0] = '.'; + cp[1] = 'd'; + cp[2] = '\0'; + + DIR *confdir = opendir (buf); + if (confdir != NULL) + { + struct dirent *ent; + while ((ent = readdir (confdir)) != NULL) + { + if (ent->d_type != DT_REG) + continue; + + size_t len = strlen (ent->d_name); + const char *suffix = ".conf"; + + if (len > strlen (suffix) + && strcmp (ent->d_name + len - strlen (suffix), suffix) == 0) + { + char *conf; + if (asprintf (&conf, "%s/%s", buf, ent->d_name) < 0) + continue; + found |= read_conf_file (conf, dir, dir_len); + free (conf); + } + } + closedir (confdir); + } + free (buf); + return found; +} |