diff options
Diffstat (limited to 'firmware/common')
-rw-r--r-- | firmware/common/strptokspn.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/firmware/common/strptokspn.c b/firmware/common/strptokspn.c new file mode 100644 index 0000000000..f4b92c0712 --- /dev/null +++ b/firmware/common/strptokspn.c | |||
@@ -0,0 +1,88 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2022 by William WIlgus | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. * | ||
19 | ****************************************************************************/ | ||
20 | |||
21 | #include "config.h" | ||
22 | |||
23 | #include <stddef.h> | ||
24 | #include <string.h> | ||
25 | #include "strtok_r.h" | ||
26 | /* strptokspn_r is a custom implementation of strtok_r that does NOT modify | ||
27 | * the source string. | ||
28 | * | ||
29 | * strptokspn_r reads ptr as a series of zero or more tokens, | ||
30 | * and sep as delimiters of the tokens | ||
31 | * The tokens can be separated by one or more of the delimiters | ||
32 | * first call searches for the first token skipping over any leading delimiters. | ||
33 | * Returns pointer to first token | ||
34 | * Pointer *len contains the span to the first delimeter | ||
35 | * (this would be the resulting strlen had token actually been NULL terminated) | ||
36 | * Pointer **end contains pointer to first character after the last delimeter | ||
37 | * | ||
38 | * When strptokspn_r is called with a ptr == NULL, the next token is read from | ||
39 | * Pointer **end | ||
40 | * | ||
41 | * Note the returned token is NOT NULL terminated by the function as in strtok_r | ||
42 | * However the caller can use ret[len+1] = '\0'; to emulate a call to strtok_r | ||
43 | */ | ||
44 | |||
45 | const char *strptokspn_r(const char *ptr, const char *sep, size_t *len, const char **end) | ||
46 | { | ||
47 | *len = 0; | ||
48 | if (!ptr) | ||
49 | /* we got NULL input so then we get our last position instead */ | ||
50 | ptr = *end; | ||
51 | |||
52 | /* pass all letters that are including in the separator string */ | ||
53 | while (*ptr && strchr(sep, *ptr)) | ||
54 | ++ptr; | ||
55 | |||
56 | if (*ptr) { | ||
57 | /* so this is where the next piece of string starts */ | ||
58 | const char *start = ptr; | ||
59 | |||
60 | /* set the end pointer to the first byte after the start */ | ||
61 | *end = start + 1; | ||
62 | |||
63 | /* scan through the string to find where it ends, it ends on a | ||
64 | null byte or a character that exists in the separator string */ | ||
65 | while (**end && !strchr(sep, **end)) | ||
66 | ++*end; | ||
67 | *len = (*end - start) - 1; /* this would be the string len if there actually was a NULL */ | ||
68 | if (**end) { /* the end is not a null byte */ | ||
69 | ++*end; /* advance last pointer to beyond the match */ | ||
70 | } | ||
71 | |||
72 | return start; /* return the position where the string starts */ | ||
73 | } | ||
74 | |||
75 | /* we ended up on a null byte, there are no more strings to find! */ | ||
76 | return NULL; | ||
77 | } | ||
78 | |||
79 | #if !defined(HAVE_STRTOK_R) | ||
80 | char * strtok_r(char *ptr, const char *sep, char **end) | ||
81 | { | ||
82 | size_t len; | ||
83 | char * ret = (char*) strptokspn_r((const char*)ptr, sep, &len, (const char**) end); | ||
84 | if (ret) | ||
85 | ret[len + 1] = '\0'; | ||
86 | return ret; | ||
87 | } | ||
88 | #endif | ||