/* $NetBSD: libdm-string.c,v 1.1.1.2 2009/12/02 00:26:08 haad Exp $ */ /* * Copyright (C) 2006-2007 Red Hat, Inc. All rights reserved. * * This file is part of the device-mapper userspace tools. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU Lesser General Public License v.2.1. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "dmlib.h" #include "libdevmapper.h" #include /* * consume characters while they match the predicate function. */ static char *_consume(char *buffer, int (*fn) (int)) { while (*buffer && fn(*buffer)) buffer++; return buffer; } static int _isword(int c) { return !isspace(c); } /* * Split buffer into NULL-separated words in argv. * Returns number of words. */ int dm_split_words(char *buffer, unsigned max, unsigned ignore_comments __attribute((unused)), char **argv) { unsigned arg; for (arg = 0; arg < max; arg++) { buffer = _consume(buffer, isspace); if (!*buffer) break; argv[arg] = buffer; buffer = _consume(buffer, _isword); if (*buffer) { *buffer = '\0'; buffer++; } } return arg; } /* * Remove hyphen quoting from a component of a name. * NULL-terminates the component and returns start of next component. */ static char *_unquote(char *component) { char *c = component; char *o = c; char *r; while (*c) { if (*(c + 1)) { if (*c == '-') { if (*(c + 1) == '-') c++; else break; } } *o = *c; o++; c++; } r = (*c) ? c + 1 : c; *o = '\0'; return r; } int dm_split_lvm_name(struct dm_pool *mem, const char *dmname, char **vgname, char **lvname, char **layer) { if (mem && !(*vgname = dm_pool_strdup(mem, dmname))) return 0; _unquote(*layer = _unquote(*lvname = _unquote(*vgname))); return 1; } /* * On error, up to glibc 2.0.6, snprintf returned -1 if buffer was too small; * From glibc 2.1 it returns number of chars (excl. trailing null) that would * have been written had there been room. * * dm_snprintf reverts to the old behaviour. */ int dm_snprintf(char *buf, size_t bufsize, const char *format, ...) { int n; va_list ap; va_start(ap, format); n = vsnprintf(buf, bufsize, format, ap); va_end(ap); if (n < 0 || ((unsigned) n + 1 > bufsize)) return -1; return n; } char *dm_basename(const char *path) { char *p = strrchr(path, '/'); return p ? p + 1 : (char *) path; } int dm_asprintf(char **result, const char *format, ...) { int n, ok = 0, size = 32; va_list ap; char *buf = dm_malloc(size); *result = 0; if (!buf) return -1; while (!ok) { va_start(ap, format); n = vsnprintf(buf, size, format, ap); if (0 <= n && n < size) ok = 1; else { dm_free(buf); size *= 2; buf = dm_malloc(size); if (!buf) return -1; }; va_end(ap); } *result = dm_strdup(buf); dm_free(buf); return n + 1; }