1*86d7f5d3SJohn Marino /* $NetBSD: libdm-string.c,v 1.1.1.2 2009/12/02 00:26:08 haad Exp $ */
2*86d7f5d3SJohn Marino
3*86d7f5d3SJohn Marino /*
4*86d7f5d3SJohn Marino * Copyright (C) 2006-2007 Red Hat, Inc. All rights reserved.
5*86d7f5d3SJohn Marino *
6*86d7f5d3SJohn Marino * This file is part of the device-mapper userspace tools.
7*86d7f5d3SJohn Marino *
8*86d7f5d3SJohn Marino * This copyrighted material is made available to anyone wishing to use,
9*86d7f5d3SJohn Marino * modify, copy, or redistribute it subject to the terms and conditions
10*86d7f5d3SJohn Marino * of the GNU Lesser General Public License v.2.1.
11*86d7f5d3SJohn Marino *
12*86d7f5d3SJohn Marino * You should have received a copy of the GNU Lesser General Public License
13*86d7f5d3SJohn Marino * along with this program; if not, write to the Free Software Foundation,
14*86d7f5d3SJohn Marino * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15*86d7f5d3SJohn Marino */
16*86d7f5d3SJohn Marino
17*86d7f5d3SJohn Marino #include "dmlib.h"
18*86d7f5d3SJohn Marino #include "libdevmapper.h"
19*86d7f5d3SJohn Marino
20*86d7f5d3SJohn Marino #include <ctype.h>
21*86d7f5d3SJohn Marino
22*86d7f5d3SJohn Marino /*
23*86d7f5d3SJohn Marino * consume characters while they match the predicate function.
24*86d7f5d3SJohn Marino */
_consume(char * buffer,int (* fn)(int))25*86d7f5d3SJohn Marino static char *_consume(char *buffer, int (*fn) (int))
26*86d7f5d3SJohn Marino {
27*86d7f5d3SJohn Marino while (*buffer && fn(*buffer))
28*86d7f5d3SJohn Marino buffer++;
29*86d7f5d3SJohn Marino
30*86d7f5d3SJohn Marino return buffer;
31*86d7f5d3SJohn Marino }
32*86d7f5d3SJohn Marino
_isword(int c)33*86d7f5d3SJohn Marino static int _isword(int c)
34*86d7f5d3SJohn Marino {
35*86d7f5d3SJohn Marino return !isspace(c);
36*86d7f5d3SJohn Marino }
37*86d7f5d3SJohn Marino
38*86d7f5d3SJohn Marino /*
39*86d7f5d3SJohn Marino * Split buffer into NULL-separated words in argv.
40*86d7f5d3SJohn Marino * Returns number of words.
41*86d7f5d3SJohn Marino */
dm_split_words(char * buffer,unsigned max,unsigned ignore_comments __attribute ((unused)),char ** argv)42*86d7f5d3SJohn Marino int dm_split_words(char *buffer, unsigned max,
43*86d7f5d3SJohn Marino unsigned ignore_comments __attribute((unused)),
44*86d7f5d3SJohn Marino char **argv)
45*86d7f5d3SJohn Marino {
46*86d7f5d3SJohn Marino unsigned arg;
47*86d7f5d3SJohn Marino
48*86d7f5d3SJohn Marino for (arg = 0; arg < max; arg++) {
49*86d7f5d3SJohn Marino buffer = _consume(buffer, isspace);
50*86d7f5d3SJohn Marino if (!*buffer)
51*86d7f5d3SJohn Marino break;
52*86d7f5d3SJohn Marino
53*86d7f5d3SJohn Marino argv[arg] = buffer;
54*86d7f5d3SJohn Marino buffer = _consume(buffer, _isword);
55*86d7f5d3SJohn Marino
56*86d7f5d3SJohn Marino if (*buffer) {
57*86d7f5d3SJohn Marino *buffer = '\0';
58*86d7f5d3SJohn Marino buffer++;
59*86d7f5d3SJohn Marino }
60*86d7f5d3SJohn Marino }
61*86d7f5d3SJohn Marino
62*86d7f5d3SJohn Marino return arg;
63*86d7f5d3SJohn Marino }
64*86d7f5d3SJohn Marino
65*86d7f5d3SJohn Marino /*
66*86d7f5d3SJohn Marino * Remove hyphen quoting from a component of a name.
67*86d7f5d3SJohn Marino * NULL-terminates the component and returns start of next component.
68*86d7f5d3SJohn Marino */
_unquote(char * component)69*86d7f5d3SJohn Marino static char *_unquote(char *component)
70*86d7f5d3SJohn Marino {
71*86d7f5d3SJohn Marino char *c = component;
72*86d7f5d3SJohn Marino char *o = c;
73*86d7f5d3SJohn Marino char *r;
74*86d7f5d3SJohn Marino
75*86d7f5d3SJohn Marino while (*c) {
76*86d7f5d3SJohn Marino if (*(c + 1)) {
77*86d7f5d3SJohn Marino if (*c == '-') {
78*86d7f5d3SJohn Marino if (*(c + 1) == '-')
79*86d7f5d3SJohn Marino c++;
80*86d7f5d3SJohn Marino else
81*86d7f5d3SJohn Marino break;
82*86d7f5d3SJohn Marino }
83*86d7f5d3SJohn Marino }
84*86d7f5d3SJohn Marino *o = *c;
85*86d7f5d3SJohn Marino o++;
86*86d7f5d3SJohn Marino c++;
87*86d7f5d3SJohn Marino }
88*86d7f5d3SJohn Marino
89*86d7f5d3SJohn Marino r = (*c) ? c + 1 : c;
90*86d7f5d3SJohn Marino *o = '\0';
91*86d7f5d3SJohn Marino
92*86d7f5d3SJohn Marino return r;
93*86d7f5d3SJohn Marino }
94*86d7f5d3SJohn Marino
dm_split_lvm_name(struct dm_pool * mem,const char * dmname,char ** vgname,char ** lvname,char ** layer)95*86d7f5d3SJohn Marino int dm_split_lvm_name(struct dm_pool *mem, const char *dmname,
96*86d7f5d3SJohn Marino char **vgname, char **lvname, char **layer)
97*86d7f5d3SJohn Marino {
98*86d7f5d3SJohn Marino if (mem && !(*vgname = dm_pool_strdup(mem, dmname)))
99*86d7f5d3SJohn Marino return 0;
100*86d7f5d3SJohn Marino
101*86d7f5d3SJohn Marino _unquote(*layer = _unquote(*lvname = _unquote(*vgname)));
102*86d7f5d3SJohn Marino
103*86d7f5d3SJohn Marino return 1;
104*86d7f5d3SJohn Marino }
105*86d7f5d3SJohn Marino
106*86d7f5d3SJohn Marino /*
107*86d7f5d3SJohn Marino * On error, up to glibc 2.0.6, snprintf returned -1 if buffer was too small;
108*86d7f5d3SJohn Marino * From glibc 2.1 it returns number of chars (excl. trailing null) that would
109*86d7f5d3SJohn Marino * have been written had there been room.
110*86d7f5d3SJohn Marino *
111*86d7f5d3SJohn Marino * dm_snprintf reverts to the old behaviour.
112*86d7f5d3SJohn Marino */
dm_snprintf(char * buf,size_t bufsize,const char * format,...)113*86d7f5d3SJohn Marino int dm_snprintf(char *buf, size_t bufsize, const char *format, ...)
114*86d7f5d3SJohn Marino {
115*86d7f5d3SJohn Marino int n;
116*86d7f5d3SJohn Marino va_list ap;
117*86d7f5d3SJohn Marino
118*86d7f5d3SJohn Marino va_start(ap, format);
119*86d7f5d3SJohn Marino n = vsnprintf(buf, bufsize, format, ap);
120*86d7f5d3SJohn Marino va_end(ap);
121*86d7f5d3SJohn Marino
122*86d7f5d3SJohn Marino if (n < 0 || ((unsigned) n + 1 > bufsize))
123*86d7f5d3SJohn Marino return -1;
124*86d7f5d3SJohn Marino
125*86d7f5d3SJohn Marino return n;
126*86d7f5d3SJohn Marino }
127*86d7f5d3SJohn Marino
dm_basename(const char * path)128*86d7f5d3SJohn Marino char *dm_basename(const char *path)
129*86d7f5d3SJohn Marino {
130*86d7f5d3SJohn Marino char *p = strrchr(path, '/');
131*86d7f5d3SJohn Marino
132*86d7f5d3SJohn Marino return p ? p + 1 : (char *) path;
133*86d7f5d3SJohn Marino }
134*86d7f5d3SJohn Marino
dm_asprintf(char ** result,const char * format,...)135*86d7f5d3SJohn Marino int dm_asprintf(char **result, const char *format, ...)
136*86d7f5d3SJohn Marino {
137*86d7f5d3SJohn Marino int n, ok = 0, size = 32;
138*86d7f5d3SJohn Marino va_list ap;
139*86d7f5d3SJohn Marino char *buf = dm_malloc(size);
140*86d7f5d3SJohn Marino
141*86d7f5d3SJohn Marino *result = 0;
142*86d7f5d3SJohn Marino
143*86d7f5d3SJohn Marino if (!buf)
144*86d7f5d3SJohn Marino return -1;
145*86d7f5d3SJohn Marino
146*86d7f5d3SJohn Marino while (!ok) {
147*86d7f5d3SJohn Marino va_start(ap, format);
148*86d7f5d3SJohn Marino n = vsnprintf(buf, size, format, ap);
149*86d7f5d3SJohn Marino if (0 <= n && n < size)
150*86d7f5d3SJohn Marino ok = 1;
151*86d7f5d3SJohn Marino else {
152*86d7f5d3SJohn Marino dm_free(buf);
153*86d7f5d3SJohn Marino size *= 2;
154*86d7f5d3SJohn Marino buf = dm_malloc(size);
155*86d7f5d3SJohn Marino if (!buf)
156*86d7f5d3SJohn Marino return -1;
157*86d7f5d3SJohn Marino };
158*86d7f5d3SJohn Marino va_end(ap);
159*86d7f5d3SJohn Marino }
160*86d7f5d3SJohn Marino
161*86d7f5d3SJohn Marino *result = dm_strdup(buf);
162*86d7f5d3SJohn Marino dm_free(buf);
163*86d7f5d3SJohn Marino return n + 1;
164*86d7f5d3SJohn Marino }
165