1 /* sb.c - string buffer manipulation routines
2 Copyright 1994, 1995, 2000, 2003, 2006 Free Software Foundation, Inc.
4 Written by Steve and Judy Chamberlain of Cygnus Support,
7 This file is part of GAS, the GNU Assembler.
9 GAS is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 GAS is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GAS; see the file COPYING. If not, write to the Free
21 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
27 /* These routines are about manipulating strings.
29 They are managed in things called `sb's which is an abbreviation
30 for string buffers. An sb has to be created, things can be glued
31 on to it, and at the end of it's life it should be freed. The
32 contents should never be pointed at whilst it is still growing,
33 since it could be moved at any time
37 sb_grow... (&foo,...);
42 static void sb_check (sb
*, int);
44 /* Statistics of sb structures. */
45 static int string_count
[sb_max_power_two
];
47 /* Free list of sb structures. */
50 sb_element
*size
[sb_max_power_two
];
53 /* Initializes an sb. */
56 sb_build (sb
*ptr
, int size
)
58 /* See if we can find one to allocate. */
61 assert (size
< sb_max_power_two
);
63 e
= free_list
.size
[size
];
66 /* Nothing there, allocate one and stick into the free list. */
67 e
= (sb_element
*) xmalloc (sizeof (sb_element
) + (1 << size
));
68 e
->next
= free_list
.size
[size
];
70 free_list
.size
[size
] = e
;
74 /* Remove from free list. */
75 free_list
.size
[size
] = e
->next
;
77 /* Copy into callers world. */
87 sb_build (ptr
, dsize
);
90 /* Deallocate the sb at ptr. */
95 /* Return item to free list. */
96 ptr
->item
->next
= free_list
.size
[ptr
->pot
];
97 free_list
.size
[ptr
->pot
] = ptr
->item
;
100 /* Add the sb at s to the end of the sb at ptr. */
103 sb_add_sb (sb
*ptr
, sb
*s
)
105 sb_check (ptr
, s
->len
);
106 memcpy (ptr
->ptr
+ ptr
->len
, s
->ptr
, s
->len
);
110 /* Helper for sb_scrub_and_add_sb. */
112 static sb
*sb_to_scrub
;
113 static char *scrub_position
;
115 scrub_from_sb (char *buf
, int buflen
)
118 copy
= sb_to_scrub
->len
- (scrub_position
- sb_to_scrub
->ptr
);
121 memcpy (buf
, scrub_position
, copy
);
122 scrub_position
+= copy
;
126 /* Run the sb at s through do_scrub_chars and add the result to the sb
130 sb_scrub_and_add_sb (sb
*ptr
, sb
*s
)
133 scrub_position
= s
->ptr
;
135 sb_check (ptr
, s
->len
);
136 ptr
->len
+= do_scrub_chars (scrub_from_sb
, ptr
->ptr
+ ptr
->len
, s
->len
);
142 /* Make sure that the sb at ptr has room for another len characters,
143 and grow it if it doesn't. */
146 sb_check (sb
*ptr
, int len
)
148 if (ptr
->len
+ len
>= 1 << ptr
->pot
)
153 while (ptr
->len
+ len
>= 1 << pot
)
155 sb_build (&tmp
, pot
);
156 sb_add_sb (&tmp
, ptr
);
162 /* Make the sb at ptr point back to the beginning. */
170 /* Add character c to the end of the sb at ptr. */
173 sb_add_char (sb
*ptr
, int c
)
176 ptr
->ptr
[ptr
->len
++] = c
;
179 /* Add null terminated string s to the end of sb at ptr. */
182 sb_add_string (sb
*ptr
, const char *s
)
184 int len
= strlen (s
);
186 memcpy (ptr
->ptr
+ ptr
->len
, s
, len
);
190 /* Add string at s of length len to sb at ptr */
193 sb_add_buffer (sb
*ptr
, const char *s
, int len
)
196 memcpy (ptr
->ptr
+ ptr
->len
, s
, len
);
200 /* Like sb_name, but don't include the null byte in the string. */
203 sb_terminate (sb
*in
)
210 /* Start at the index idx into the string in sb at ptr and skip
211 whitespace. return the index of the first non whitespace character. */
214 sb_skip_white (int idx
, sb
*ptr
)
216 while (idx
< ptr
->len
217 && (ptr
->ptr
[idx
] == ' '
218 || ptr
->ptr
[idx
] == '\t'))
223 /* Start at the index idx into the sb at ptr. skips whitespace,
224 a comma and any following whitespace. returns the index of the
228 sb_skip_comma (int idx
, sb
*ptr
)
230 while (idx
< ptr
->len
231 && (ptr
->ptr
[idx
] == ' '
232 || ptr
->ptr
[idx
] == '\t'))
236 && ptr
->ptr
[idx
] == ',')
239 while (idx
< ptr
->len
240 && (ptr
->ptr
[idx
] == ' '
241 || ptr
->ptr
[idx
] == '\t'))
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