/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 <string.h> #include "macro.h" #include "util.h" #include "specifier.h" /* * Generic infrastructure for replacing %x style specifiers in * strings. Will call a callback for each replacement. * */ char *specifier_printf(const char *text, const Specifier table[], void *userdata) { char *r, *t; const char *f; bool percent = false; size_t l; assert(text); assert(table); l = strlen(text); r = new(char, l+1); if (!r) return NULL; t = r; 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) { char *n, *w; size_t k, j; w = i->lookup(i->specifier, i->data, userdata); if (!w) { free(r); return NULL; } j = t - r; k = strlen(w); n = new(char, j + k + l + 1); if (!n) { free(r); free(w); return NULL; } memcpy(n, r, j); memcpy(n + j, w, k); free(r); free(w); r = n; t = n + j + k; } else { *(t++) = '%'; *(t++) = *f; } } percent = false; } else if (*f == '%') percent = true; else *(t++) = *f; } *t = 0; return r; } /* Generic handler for simple string replacements */ char* specifier_string(char specifier, void *data, void *userdata) { return strdup(strempty(data)); } char *specifier_machine_id(char specifier, void *data, void *userdata) { sd_id128_t id; char *buf; int r; r = sd_id128_get_machine(&id); if (r < 0) return NULL; buf = new(char, 33); if (!buf) return NULL; return sd_id128_to_string(id, buf); } char *specifier_boot_id(char specifier, void *data, void *userdata) { sd_id128_t id; char *buf; int r; r = sd_id128_get_boot(&id); if (r < 0) return NULL; buf = new(char, 33); if (!buf) return NULL; return sd_id128_to_string(id, buf); } char *specifier_host_name(char specifier, void *data, void *userdata) { return gethostname_malloc(); }