1 /* sprintf.c */
2
3 /*
4 * Copyright (c) 1997-2010, 2013-2014 Wind River Systems, Inc.
5 *
6 * SPDX-License-Identifier: Apache-2.0
7 */
8
9 #include <stdarg.h>
10 #include <stdio.h>
11 #include <zephyr/sys/cbprintf.h>
12
13 struct emitter {
14 char *ptr;
15 int len;
16 };
17
sprintf_out(int c,struct emitter * p)18 static int sprintf_out(int c, struct emitter *p)
19 {
20 if (p->len > 1) { /* need to reserve a byte for EOS */
21 *(p->ptr) = c;
22 p->ptr += 1;
23 p->len -= 1;
24 }
25 return 0; /* indicate keep going so we get the total count */
26 }
27
snprintf(char * ZRESTRICT str,size_t len,const char * ZRESTRICT format,...)28 int snprintf(char *ZRESTRICT str, size_t len,
29 const char *ZRESTRICT format, ...)
30 {
31 va_list vargs;
32
33 struct emitter p;
34 int r;
35 char dummy;
36
37 if (len == 0) {
38 str = &dummy; /* write final NUL to dummy, can't change *s */
39 }
40
41 p.ptr = str;
42 p.len = (int) len;
43
44 va_start(vargs, format);
45 r = cbvprintf(sprintf_out, (void *) (&p), format, vargs);
46 va_end(vargs);
47
48 *(p.ptr) = 0;
49 return r;
50 }
51
sprintf(char * ZRESTRICT str,const char * ZRESTRICT format,...)52 int sprintf(char *ZRESTRICT str, const char *ZRESTRICT format, ...)
53 {
54 va_list vargs;
55
56 struct emitter p;
57 int r;
58
59 p.ptr = str;
60 p.len = (int) 0x7fffffff; /* allow up to "maxint" characters */
61
62 va_start(vargs, format);
63 r = cbvprintf(sprintf_out, (void *) (&p), format, vargs);
64 va_end(vargs);
65
66 *(p.ptr) = 0;
67 return r;
68 }
69
vsnprintf(char * ZRESTRICT str,size_t len,const char * ZRESTRICT format,va_list vargs)70 int vsnprintf(char *ZRESTRICT str, size_t len,
71 const char *ZRESTRICT format, va_list vargs)
72 {
73 struct emitter p;
74 int r;
75 char dummy;
76
77 if (len == 0) {
78 str = &dummy; /* write final NUL to dummy, can't change * *s */
79 }
80
81 p.ptr = str;
82 p.len = (int) len;
83
84 r = cbvprintf(sprintf_out, (void *) (&p), format, vargs);
85
86 *(p.ptr) = 0;
87 return r;
88 }
89
vsprintf(char * ZRESTRICT str,const char * ZRESTRICT format,va_list vargs)90 int vsprintf(char *ZRESTRICT str, const char *ZRESTRICT format,
91 va_list vargs)
92 {
93 struct emitter p;
94 int r;
95
96 p.ptr = str;
97 p.len = (int) 0x7fffffff; /* allow up to "maxint" characters */
98
99 r = cbvprintf(sprintf_out, (void *) (&p), format, vargs);
100
101 *(p.ptr) = 0;
102 return r;
103 }
104
