1 /* ldif-filter -- clean up LDIF testdata from stdin */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
5 * Copyright 2009 The OpenLDAP Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
12 * A copy of this license is available in file LICENSE in the
13 * top-level directory of the distribution or, alternatively, at
14 * <http://www.OpenLDAP.org/license.html>.
21 #include <ac/stdlib.h>
22 #include <ac/string.h>
24 #define DEFAULT_SPECS "ndb=a,null=n"
26 typedef struct { char *val; size_t len, alloc; } String;
27 typedef struct { String *val; size_t len, alloc; } Strings;
29 /* Flags and corresponding program options */
30 enum { SORT_ATTRS = 1, SORT_ENTRIES = 2, NO_OUTPUT = 4, DUMMY_FLAG = 8 };
31 static const char spec_options[] = "aen"; /* option index = log2(enum flag) */
33 static const char *progname = "ldif-filter";
34 static const String null_string = { NULL, 0, 0 };
40 Usage: %s [backend] [spec[,spec]...]\n\
41 Filter standard input by first <spec> matching '[<backend>]=[a][e][n]':\n\
42 - Remove LDIF comments.\n\
43 - 'a': Sort attributes in entries.\n\
44 - 'e': Sort any entries separated by just one empty line.\n\
45 - 'n': Output nothing.\n\
46 <backend> defaults to the $BACKEND environment variable.\n\
47 Use specs '%s' if no spec on the command line applies.\n",
48 progname, DEFAULT_SPECS );
52 /* Return flags from "backend=flags" in spec; nonzero if backend found */
54 get_flags( const char *backend, const char *spec )
56 size_t len = strlen( backend );
57 unsigned flags = DUMMY_FLAG;
60 while ( '=' != *(spec += strncmp( spec, backend, len ) ? 0 : len) ) {
61 if ( (spec = strchr( spec, ',' )) == NULL ) {
66 while ( *++spec && *spec != ',' ) {
67 if ( (tmp = strchr( spec_options, *spec )) == NULL ) {
70 flags |= 1U << (tmp - spec_options);
75 #define APPEND(s /* String or Strings */, data, count, isString) do { \
76 size_t slen = (s)->len, salloc = (s)->alloc, sz = sizeof *(s)->val; \
77 if ( salloc <= slen + (count) ) { \
78 (s)->alloc = salloc += salloc + ((count)|7) + 1; \
79 (s)->val = xrealloc( (s)->val, sz * salloc ); \
81 memcpy( (s)->val + slen, data, sz * ((count) + !!(isString)) ); \
82 (s)->len = slen + (count); \
86 xrealloc( void *ptr, size_t len )
88 if ( (ptr = realloc( ptr, len )) == NULL ) {
96 cmp( const void *s, const void *t )
98 return strcmp( ((const String *) s)->val, ((const String *) t)->val );
102 sort_strings( Strings *ss, size_t offset )
104 qsort( ss->val + offset, ss->len - offset, sizeof(*ss->val), cmp );
107 /* Build entry ss[n] from attrs ss[n...], and free the attrs */
109 build_entry( Strings *ss, size_t n, unsigned flags, size_t new_len )
111 String *vals = ss->val, *e = &vals[n];
112 size_t end = ss->len;
115 if ( flags & SORT_ATTRS ) {
116 sort_strings( ss, n + 1 );
118 e->val = xrealloc( e->val, e->alloc = new_len + 1 );
119 ptr = e->val + e->len;
122 for ( ; n < end; free( vals[n++].val )) {
123 ptr = strcpy( ptr, vals[n].val ) + vals[n].len;
125 assert( ptr == e->val + new_len );
128 /* Flush entries to stdout and free them */
130 flush_entries( Strings *ss, const char *sep, unsigned flags )
132 size_t i, end = ss->len;
133 const char *prefix = "";
135 if ( flags & SORT_ENTRIES ) {
136 sort_strings( ss, 0 );
138 for ( i = 0; i < end; i++, prefix = sep ) {
139 if ( printf( "%s%s", prefix, ss->val[i].val ) < 0 ) {
141 exit( EXIT_FAILURE );
143 free( ss->val[i].val );
149 filter_stdin( unsigned flags )
152 Strings ss = { NULL, 0, 0 }; /* entries + attrs of partial entry */
153 size_t entries = 0, attrs_totlen = 0, line_len;
154 const char *entry_sep = "\n", *sep = "";
155 int comment = 0, eof = 0, eol, prev_eol = 1; /* flags */
158 /* LDIF = Entries ss[..entries-1] + sep + attrs ss[entries..] + line */
159 for ( ; !eof || ss.len || *sep; prev_eol = eol ) {
160 if ( eof || (eof = !fgets( line, sizeof(line), stdin ))) {
161 strcpy( line, prev_eol ? "" : *sep ? sep : "\n" );
163 line_len = strlen( line );
164 eol = (line_len == 0 || line[line_len - 1] == '\n');
166 if ( *line == ' ' ) { /* continuation line? */
168 } else if ( prev_eol ) { /* start of logical line? */
169 comment = (*line == '#');
171 if ( comment || (flags & NO_OUTPUT) ) {
175 /* Collect attrs for partial entry in ss[entries...] */
176 if ( !prev_eol && attrs_totlen != 0 ) {
178 } else if ( line_len > (*line == '\r' ? 2 : 1) ) {
179 APPEND( &ss, &null_string, 1, 0 ); /* new attr */
181 s = &ss.val[ss.len - 1];
182 APPEND( s, line, line_len, 1 ); /* strcat to attr */
183 attrs_totlen += line_len;
187 /* Empty line - consume sep+attrs or entries+sep */
188 if ( attrs_totlen != 0 ) {
191 fputs( sep, stdout );
192 build_entry( &ss, entries++, flags, attrs_totlen );
195 flush_entries( &ss, entry_sep, flags );
196 fputs( sep, stdout );
199 sep = "\r\n" + 2 - line_len; /* sep = copy(line) */
206 main( int argc, char **argv )
208 const char *backend, *specs, *tmp;
212 progname = (tmp = strrchr( argv[0], '/' )) ? tmp+1 : argv[0];
214 specs = (argc > 1 && strchr( argv[argc-1], '=' )) ? argv[--argc] : "";
215 backend = (argc > 1 && isalnum( (unsigned char) *argv[argc-1] ))
216 ? argv[--argc] : (tmp = getenv( "BACKEND" )) ? tmp : "";
221 flags = get_flags( backend, specs );
222 filter_stdin( flags ? flags : get_flags( backend, DEFAULT_SPECS ));
223 if ( fclose( stdout ) == EOF ) {