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
|
/*******************************************************************************
* Copyright (C) 2018 Cadence Design Systems, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to use this Software with Cadence processor cores only and
* not with any other processors and platforms, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
******************************************************************************/
#include <string.h>
#include "lib/tinyput.h"
/*
* Simple formatted output routine.
* Designed primarily for small size (and secondarily for efficiency).
* Only a common subset of printf formats and options are handled:
*
* %[-+ ][0][width]i decimal signed integer
* %[-+ ][0][width]d decimal signed integer
* %[-][0][width]u decimal unsigned integer
* %[-][0][width]x hex unsigned integer
* %[-][0][width]p hex unsigned integer with 0x prefix ("pointer")
* %[-][width]c single character
* %[-][width]s string
*
* These modifiers are ignored (legally on 32-bit Xtensa):
* # (alternate format)
* h (short) expands to int on 32-bit Xtensa
* l (long) same as int on 32-bit Xtensa
* j (intmax_t or uintmax_t) same as int on 32-bit Xtensa
* z (size_t or ssize_t) same as int on 32-bit Xtensa
* t (ptrdiff_t) same as int on 32-bit Xtensa
*
* Does NOT support:
* width.prec (precision modifier)
* %X (capitalized hex; handles this as lowercase hex)
* %o (octal)
* %[L][feEgG] (floating point formats)
* %a %A (hex floating point formats, C99)
* %C (multibyte character)
* %S (multibyte character string)
* %n (returning count of character written)
* ll (long long)
* q j z t (other size modifiers, eg. see glibc)
*/
int tiny_vsprintf(char *out, const char *fmt, va_list ap)
{
int total = 0;
char c, space = ' ', buf[11]; /* largest 32-bit integer output (octal) */
while ((c = *(char*)fmt++) != 0) {
if (c != '%') {
*out++ = c;
total++;
} else {
int width = 0, len = 1, rightjust = 1;
unsigned n;
char *s = buf, *t, pad = ' ', sign = 0;
while (1) {
c = *(char*)fmt++;
switch (c) {
case 'c': buf[0] = va_arg(ap, int); goto donefmt;
case 's': s = va_arg(ap, char*);
if (s == 0)
len = 0;
else {
for (t = s; *t; t++) ;
len = t - s;
}
goto donefmt;
case '#': /* ignore (not supported) */
case 'h': /* ignore (short; passed as int) */
case 'l': /* ignore (long; same as int) */
case 'j': /* ignore (intmax_t or uintmax_t; same as int) */
case 'z': /* ignore (size_t or ssize_t; same as int) */
case 't': /* ignore (ptrdiff_t; same as int) */
break;
case ' ': sign = ' '; break;
case '+': sign = '+'; break;
case '-': rightjust = 0; break;
case 'i': /*FALLTHROUGH*/
case 'd': n = va_arg(ap, int);
if ((int)n < 0) {
sign = '-';
n = -(int)n;
}
if (sign) {
if (rightjust && pad == ' ')
*s++ = sign;
else {
*out++ = sign;
width--;
total++;
}
}
goto do_decimal;
case 'u': n = va_arg(ap, int);
do_decimal:
{
/* (avoids division or multiplication) */
int digit, i, seen = 0;
for (digit = 0; n >= 1000000000; digit++)
n -= 1000000000;
for (i = 9;;) {
if (!seen && digit != 0)
seen = i;
if (seen)
*s++ = '0' + digit;
for (digit = 0; n >= 100000000; digit++)
n -= 100000000;
if (--i == 0) {
*s++ = '0' + digit;
len = s - buf;
s = buf;
goto donefmt;
}
n = ((n << 1) + (n << 3));
}
}
/*NOTREACHED*/
#if 0
case 'o': n = va_arg(ap, unsigned);
s = buf + 11;
do {
*--s = '0' + (n & 7);
n = (unsigned)n >> 3;
} while (n);
len = buf + 11 - s;
goto donefmt;
#endif
case 'p': *out++ = '0', *out++ = 'x';
total += 2;
/*FALLTHROUGH*/
case 'X': /*FALLTHROUGH*/
case 'x': n = va_arg(ap, unsigned);
s = buf + 8;
do {
*--s = "0123456789abcdef"[n & 0xF];
n = (unsigned)n >> 4;
} while (n);
len = buf + 8 - s;
goto donefmt;
case 0: goto done;
case '0': if (width == 0) pad = '0'; /*FALLTHROUGH*/
default: if (c >= '0' && c <= '9')
width = ((width<<1) + (width<<3)) + (c - '0');
else {
buf[0] = c; /* handles case of '%' */
goto donefmt;
}
}
}
/*NOTREACHED*/
donefmt:
if (len < width) {
total += width;
if (rightjust)
do { *out++ = pad; } while (len < --width);
} else
total += len;
for(n = len; n > 0; n--) *out++ = *s++;
for (; len < width; len++) *out++ = space;
}
}
done:
return total;
}
int tiny_sprintf(char *out, const char *fmt, ...)
{
int n = 0;
va_list ap;
va_start(ap, fmt);
n = tiny_vsprintf(out, fmt, ap);
va_end(ap);
return n;
}
|
