summaryrefslogtreecommitdiffstats
path: root/src/lib/snprintf.h
blob: c80de2d0244c6a0351468fd60ba4cbd199db5bcb (plain)
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
218
219
220
/*
 Unix snprintf implementation.
 Version 1.4

   This program 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.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   Revision History:
		   see header of snprintf.c.

format:
  int snprintf(holder, sizeof_holder, format, ...)

Return values:
  (sizeof_holder - 1)


 THANKS(for the patches and ideas):
     Miles Bader
     Cyrille Rustom
     Jacek Slabocewiz
     Mike Parker(mouse)

Alain Magloire: alainm@rcsm.ee.mcgill.ca
*/

#ifndef HAVE_VSNPRINTF

RCSIDH(snprintf_h, "$Id$")

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#include <stdlib.h>    /* for atoi() */
#include <ctype.h>

#define PRIVATE static
#define PUBLIC

/*
 * For the FLOATING POINT FORMAT :
 *  the challenge was finding a way to
 *  manipulate the Real numbers without having
 *  to resort to mathematical function(it
 *  would require to link with -lm) and not
 *  going down to the bit pattern(not portable)
 *
 *  so a number, a real is:

      real = integral + fraction

      integral = ... + a(2)*10^2 + a(1)*10^1 + a(0)*10^0
      fraction = b(1)*10^-1 + b(2)*10^-2 + ...

      where:
       0 <= a(i) => 9
       0 <= b(i) => 9

    from then it was simple math
 */

/*
 * size of the buffer for the integral part
 * and the fraction part
 */
#define MAX_INT  99 + 1 /* 1 for the null */
#define MAX_FRACT 29 + 1

/*
 * If the compiler supports (long long)
 */
#ifndef LONG_LONG
# define LONG_LONG long long
/*# define LONG_LONG int64_t*/
#endif

/*
 * If the compiler supports (long double)
 */
#ifndef LONG_DOUBLE
# define LONG_DOUBLE long double
/*# define LONG_DOUBLE double*/
#endif

/*
 * numtoa() uses PRIVATE buffers to store the results,
 * So this function is not reentrant
 */
#define itoa(n) numtoa(n, 10, 0, (char **)0)
#define otoa(n) numtoa(n, 8, 0, (char **)0)
#define htoa(n) numtoa(n, 16, 0, (char **)0)
#define dtoa(n, p, f) numtoa(n, 10, p, f)

#define SWAP_INT(a,b) {int t; t = (a); (a) = (b); (b) = t;}

/* this struct holds everything we need */
struct DATA {
  int length;
  char *holder;
  int counter;
#ifdef __STDC__
  char const *pf;
#else
  char *pf;
#endif
/* FLAGS */
  int width, precision;
  int justify; char pad;
  int square, space, star_w, star_p, a_long, a_longlong;
};

/* signature of the functions */
#ifdef __STDC__
/* the floating point stuff */
  PRIVATE double pow_10(int);
  PRIVATE int log_10(double);
  PRIVATE double integral(double, double *);
  PRIVATE char * numtoa(double, int, int, char **);

/* for the format */
  PRIVATE void conv_flag(char *, struct DATA *);
  PRIVATE void floating(struct DATA *, double);
  PRIVATE void exponent(struct DATA *, double);
  PRIVATE void decimal(struct DATA *, double);
  PRIVATE void octal(struct DATA *, double);
  PRIVATE void hexa(struct DATA *, double);
  PRIVATE void strings(struct DATA *, char *);

#else
/* the floating point stuff */
  PRIVATE double pow_10();
  PRIVATE int log_10();
  PRIVATE double integral();
  PRIVATE char * numtoa();

/* for the format */
  PRIVATE void conv_flag();
  PRIVATE void floating();
  PRIVATE void exponent();
  PRIVATE void decimal();
  PRIVATE void octal();
  PRIVATE void hexa();
  PRIVATE void strings();
#endif

/* those are defines specific to snprintf to hopefully
 * make the code clearer :-)
 */
#define RIGHT 1
#define LEFT  0
#define NOT_FOUND -1
#define FOUND 1
#define MAX_FIELD 15

/* the conversion flags */
#define isflag(c) ((c) == '#' || (c) == ' ' || \
		   (c) == '*' || (c) == '+' || \
		   (c) == '-' || (c) == '.' || \
		   isdigit(c))

/* round off to the precision */
#define ROUND(d, p) \
	    (d < 0.) ? \
	     d - pow_10(-(p)->precision) * 0.5 : \
	     d + pow_10(-(p)->precision) * 0.5

/* set default precision */
#define DEF_PREC(p) \
	    if ((p)->precision == NOT_FOUND) \
	      (p)->precision = 6

/* put a char */
#define PUT_CHAR(c, p) \
	    if ((p)->counter < (p)->length) { \
	      *(p)->holder++ = (c); \
	      (p)->counter++; \
	    }

#define PUT_PLUS(d, p) \
	    if ((d) > 0. && (p)->justify == RIGHT) \
	      PUT_CHAR('+', p)

#define PUT_SPACE(d, p) \
	    if ((p)->space == FOUND && (d) > 0.) \
	      PUT_CHAR(' ', p)

/* pad right */
#define PAD_RIGHT(p) \
	    if ((p)->width > 0 && (p)->justify != LEFT) \
	      for (; (p)->width > 0; (p)->width--) \
		 PUT_CHAR((p)->pad, p)

/* pad left */
#define PAD_LEFT(p) \
	    if ((p)->width > 0 && (p)->justify == LEFT) \
	      for (; (p)->width > 0; (p)->width--) \
		 PUT_CHAR((p)->pad, p)

/* if width and prec. in the args */
#define STAR_ARGS(p) \
	    if ((p)->star_w == FOUND) \
	      (p)->width = va_arg(args, int); \
	    if ((p)->star_p == FOUND) \
	      (p)->precision = va_arg(args, int)

#endif /* HAVE_VSNPRINTF */