Annotation of embedaddon/php/ext/bcmath/libbcmath/src/str2num.c, revision 1.1.1.1
1.1 misho 1: /* str2num.c: bcmath library file. */
2: /*
3: Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
4: Copyright (C) 2000 Philip A. Nelson
5:
6: This library is free software; you can redistribute it and/or
7: modify it under the terms of the GNU Lesser General Public
8: License as published by the Free Software Foundation; either
9: version 2 of the License, or (at your option) any later version.
10:
11: This library is distributed in the hope that it will be useful,
12: but WITHOUT ANY WARRANTY; without even the implied warranty of
13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: Lesser General Public License for more details. (COPYING.LIB)
15:
16: You should have received a copy of the GNU Lesser General Public
17: License along with this library; if not, write to:
18:
19: The Free Software Foundation, Inc.
20: 59 Temple Place, Suite 330
21: Boston, MA 02111-1307 USA.
22:
23: You may contact the author by:
24: e-mail: philnelson@acm.org
25: us-mail: Philip A. Nelson
26: Computer Science Department, 9062
27: Western Washington University
28: Bellingham, WA 98226-9062
29:
30: *************************************************************************/
31:
32: #include <config.h>
33: #include <stdio.h>
34: #include <assert.h>
35: #include <stdlib.h>
36: #include <ctype.h>
37: #include <stdarg.h>
38: #include "bcmath.h"
39: #include "private.h"
40:
41: /* Convert strings to bc numbers. Base 10 only.*/
42:
43: void
44: bc_str2num (bc_num *num, char *str, int scale TSRMLS_DC)
45: {
46: int digits, strscale;
47: char *ptr, *nptr;
48: char zero_int;
49:
50: /* Prepare num. */
51: bc_free_num (num);
52:
53: /* Check for valid number and count digits. */
54: ptr = str;
55: digits = 0;
56: strscale = 0;
57: zero_int = FALSE;
58: if ( (*ptr == '+') || (*ptr == '-')) ptr++; /* Sign */
59: while (*ptr == '0') ptr++; /* Skip leading zeros. */
60: while (isdigit((int)*ptr)) ptr++, digits++; /* digits */
61: if (*ptr == '.') ptr++; /* decimal point */
62: while (isdigit((int)*ptr)) ptr++, strscale++; /* digits */
63: if ((*ptr != '\0') || (digits+strscale == 0))
64: {
65: *num = bc_copy_num (BCG(_zero_));
66: return;
67: }
68:
69: /* Adjust numbers and allocate storage and initialize fields. */
70: strscale = MIN(strscale, scale);
71: if (digits == 0)
72: {
73: zero_int = TRUE;
74: digits = 1;
75: }
76: *num = bc_new_num (digits, strscale);
77:
78: /* Build the whole number. */
79: ptr = str;
80: if (*ptr == '-')
81: {
82: (*num)->n_sign = MINUS;
83: ptr++;
84: }
85: else
86: {
87: (*num)->n_sign = PLUS;
88: if (*ptr == '+') ptr++;
89: }
90: while (*ptr == '0') ptr++; /* Skip leading zeros. */
91: nptr = (*num)->n_value;
92: if (zero_int)
93: {
94: *nptr++ = 0;
95: digits = 0;
96: }
97: for (;digits > 0; digits--)
98: *nptr++ = CH_VAL(*ptr++);
99:
100:
101: /* Build the fractional part. */
102: if (strscale > 0)
103: {
104: ptr++; /* skip the decimal point! */
105: for (;strscale > 0; strscale--)
106: *nptr++ = CH_VAL(*ptr++);
107: }
108: }
109:
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