diff options
Diffstat (limited to 'src/libshared/specifier.c')
| -rw-r--r-- | src/libshared/specifier.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/libshared/specifier.c b/src/libshared/specifier.c new file mode 100644 index 0000000000..303ddf0401 --- /dev/null +++ b/src/libshared/specifier.c @@ -0,0 +1,188 @@ +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd 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. + + systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <errno.h> +#include <stdbool.h> +#include <stddef.h> +#include <stdlib.h> +#include <string.h> +#include <sys/utsname.h> + +#include <systemd/sd-id128.h> + +#include "alloc-util.h" +#include "hostname-util.h" +#include "macro.h" +#include "specifier.h" +#include "string-util.h" + +/* + * Generic infrastructure for replacing %x style specifiers in + * strings. Will call a callback for each replacement. + * + */ + +int specifier_printf(const char *text, const Specifier table[], void *userdata, char **_ret) { + char *ret, *t; + const char *f; + bool percent = false; + size_t l; + int r; + + assert(text); + assert(table); + + l = strlen(text); + ret = new(char, l+1); + if (!ret) + return -ENOMEM; + + t = ret; + + for (f = text; *f; f++, l--) { + + if (percent) { + if (*f == '%') + *(t++) = '%'; + else { + const Specifier *i; + + for (i = table; i->specifier; i++) + if (i->specifier == *f) + break; + + if (i->lookup) { + _cleanup_free_ char *w = NULL; + char *n; + size_t k, j; + + r = i->lookup(i->specifier, i->data, userdata, &w); + if (r < 0) { + free(ret); + return r; + } + + j = t - ret; + k = strlen(w); + + n = new(char, j + k + l + 1); + if (!n) { + free(ret); + return -ENOMEM; + } + + memcpy(n, ret, j); + memcpy(n + j, w, k); + + free(ret); + + ret = n; + t = n + j + k; + } else { + *(t++) = '%'; + *(t++) = *f; + } + } + + percent = false; + } else if (*f == '%') + percent = true; + else + *(t++) = *f; + } + + *t = 0; + *_ret = ret; + return 0; +} + +/* Generic handler for simple string replacements */ + +int specifier_string(char specifier, void *data, void *userdata, char **ret) { + char *n; + + n = strdup(strempty(data)); + if (!n) + return -ENOMEM; + + *ret = n; + return 0; +} + +int specifier_machine_id(char specifier, void *data, void *userdata, char **ret) { + sd_id128_t id; + char *n; + int r; + + r = sd_id128_get_machine(&id); + if (r < 0) + return r; + + n = new(char, 33); + if (!n) + return -ENOMEM; + + *ret = sd_id128_to_string(id, n); + return 0; +} + +int specifier_boot_id(char specifier, void *data, void *userdata, char **ret) { + sd_id128_t id; + char *n; + int r; + + r = sd_id128_get_boot(&id); + if (r < 0) + return r; + + n = new(char, 33); + if (!n) + return -ENOMEM; + + *ret = sd_id128_to_string(id, n); + return 0; +} + +int specifier_host_name(char specifier, void *data, void *userdata, char **ret) { + char *n; + + n = gethostname_malloc(); + if (!n) + return -ENOMEM; + + *ret = n; + return 0; +} + +int specifier_kernel_release(char specifier, void *data, void *userdata, char **ret) { + struct utsname uts; + char *n; + int r; + + r = uname(&uts); + if (r < 0) + return -errno; + + n = strdup(uts.release); + if (!n) + return -ENOMEM; + + *ret = n; + return 0; +} |