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cce855bc JA |
1 | /* itos.c -- Convert integer to string. */ |
2 | ||
3 | /* Copyright (C) 1998, Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
7 | Bash is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
11 | ||
12 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License along | |
18 | with Bash; see the file COPYING. If not, write to the Free Software | |
19 | Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
21 | #include <config.h> | |
22 | ||
23 | #if defined (HAVE_UNISTD_H) | |
24 | # include <unistd.h> | |
25 | #endif | |
26 | ||
27 | #include "bashansi.h" | |
28 | #include "shell.h" | |
29 | ||
30 | /* Number of characters that can appear in a string representation | |
31 | of an integer. 32 is larger than the string rep of 2^^31 - 1. */ | |
32 | #define MAX_INT_LEN 32 | |
33 | ||
b72432fd JA |
34 | /* Integer to string conversion. The caller passes the buffer and |
35 | the size. This should check for buffer underflow, but currently | |
36 | does not. */ | |
cce855bc | 37 | char * |
b72432fd | 38 | inttostr (i, buf, len) |
cce855bc | 39 | int i; |
b72432fd JA |
40 | char *buf; |
41 | int len; | |
cce855bc | 42 | { |
b72432fd | 43 | char *p; |
cce855bc JA |
44 | int negative = 0; |
45 | unsigned int ui; | |
46 | ||
47 | if (i < 0) | |
48 | { | |
49 | negative++; | |
50 | i = -i; | |
51 | } | |
52 | ||
53 | ui = (unsigned int) i; | |
54 | ||
b72432fd | 55 | p = buf + len - 2; |
cce855bc JA |
56 | p[1] = '\0'; |
57 | ||
58 | do | |
59 | *p-- = (ui % 10) + '0'; | |
60 | while (ui /= 10); | |
61 | ||
62 | if (negative) | |
63 | *p-- = '-'; | |
64 | ||
b72432fd JA |
65 | return (p + 1); |
66 | } | |
67 | ||
68 | /* Integer to string conversion. This conses the string; the | |
69 | caller should free it. */ | |
70 | char * | |
71 | itos (i) | |
72 | int i; | |
73 | { | |
74 | char *p, lbuf[MAX_INT_LEN]; | |
75 | ||
76 | p = inttostr (i, lbuf, sizeof(lbuf)); | |
77 | return (savestring (p)); | |
cce855bc | 78 | } |