File: concat.c

package info (click to toggle)
gdb 8.2.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 223,696 kB
  • sloc: ansic: 1,936,156; asm: 341,757; exp: 146,606; makefile: 56,749; sh: 23,776; cpp: 20,830; yacc: 12,914; perl: 5,331; ada: 4,977; python: 4,617; xml: 4,176; pascal: 3,134; lisp: 1,527; cs: 879; lex: 620; f90: 479; sed: 228; awk: 140; objc: 134; fortran: 43
file content (217 lines) | stat: -rw-r--r-- 4,992 bytes parent folder | download | duplicates (11)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
/* Concatenate variable number of strings.
   Copyright (C) 1991-2018 Free Software Foundation, Inc.
   Written by Fred Fish @ Cygnus Support

This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

Libiberty 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA.  */


/*

@deftypefn Extension char* concat (const char *@var{s1}, const char *@var{s2}, @
  @dots{}, @code{NULL})

Concatenate zero or more of strings and return the result in freshly
@code{xmalloc}ed memory.  The argument list is terminated by the first
@code{NULL} pointer encountered.  Pointers to empty strings are ignored.

@end deftypefn

*/


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ansidecl.h"
#include "libiberty.h"
#include <sys/types.h>		/* size_t */

#include <stdarg.h>

# if HAVE_STRING_H
#  include <string.h>
# else
#  if HAVE_STRINGS_H
#   include <strings.h>
#  endif
# endif

#if HAVE_STDLIB_H
#include <stdlib.h>
#endif

static inline unsigned long vconcat_length (const char *, va_list);
static inline unsigned long
vconcat_length (const char *first, va_list args)
{
  unsigned long length = 0;
  const char *arg;

  for (arg = first; arg ; arg = va_arg (args, const char *))
    length += strlen (arg);

  return length;
}

static inline char *
vconcat_copy (char *dst, const char *first, va_list args)
{
  char *end = dst;
  const char *arg;

  for (arg = first; arg ; arg = va_arg (args, const char *))
    {
      unsigned long length = strlen (arg);
      memcpy (end, arg, length);
      end += length;
    }
  *end = '\000';

  return dst;
}

/* @undocumented concat_length */

unsigned long
concat_length (const char *first, ...)
{
  unsigned long length;
  va_list args;

  va_start (args, first);
  length = vconcat_length (first, args);
  va_end (args);

  return length;
}

/* @undocumented concat_copy */

char *
concat_copy (char *dst, const char *first, ...)
{
  char *save_dst;
  va_list args;

  va_start (args, first);
  vconcat_copy (dst, first, args);
  save_dst = dst; /* With K&R C, dst goes out of scope here.  */
  va_end (args);

  return save_dst;
}

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
char *libiberty_concat_ptr;
#ifdef __cplusplus
}
#endif /* __cplusplus */

/* @undocumented concat_copy2 */

char *
concat_copy2 (const char *first, ...)
{
  va_list args;
  va_start (args, first);
  vconcat_copy (libiberty_concat_ptr, first, args);
  va_end (args);

  return libiberty_concat_ptr;
}

char *
concat (const char *first, ...)
{
  char *newstr;
  va_list args;

  /* First compute the size of the result and get sufficient memory.  */
  va_start (args, first);
  newstr = XNEWVEC (char, vconcat_length (first, args) + 1);
  va_end (args);

  /* Now copy the individual pieces to the result string. */
  va_start (args, first);
  vconcat_copy (newstr, first, args);
  va_end (args);

  return newstr;
}

/*

@deftypefn Extension char* reconcat (char *@var{optr}, const char *@var{s1}, @
  @dots{}, @code{NULL})

Same as @code{concat}, except that if @var{optr} is not @code{NULL} it
is freed after the string is created.  This is intended to be useful
when you're extending an existing string or building up a string in a
loop:

@example
  str = reconcat (str, "pre-", str, NULL);
@end example

@end deftypefn

*/

char *
reconcat (char *optr, const char *first, ...)
{
  char *newstr;
  va_list args;

  /* First compute the size of the result and get sufficient memory.  */
  va_start (args, first);
  newstr = XNEWVEC (char, vconcat_length (first, args) + 1);
  va_end (args);

  /* Now copy the individual pieces to the result string. */
  va_start (args, first);
  vconcat_copy (newstr, first, args);
  if (optr) /* Done before VA_CLOSE so optr stays in scope for K&R C.  */
    free (optr);
  va_end (args);

  return newstr;
}

#ifdef MAIN
#define NULLP (char *)0

/* Simple little test driver. */

#include <stdio.h>

int
main (void)
{
  printf ("\"\" = \"%s\"\n", concat (NULLP));
  printf ("\"a\" = \"%s\"\n", concat ("a", NULLP));
  printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP));
  printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP));
  printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP));
  printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP));
  printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP));
  return 0;
}

#endif