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1 | /* dquote_inline.h |
2 | * | |
3 | * Copyright (C) 2015 by Larry Wall and others | |
4 | * | |
5 | * You may distribute under the terms of either the GNU General Public | |
6 | * License or the Artistic License, as specified in the README file. | |
7 | */ | |
8 | ||
9 | #ifndef DQUOTE_INLINE_H /* Guard against nested #inclusion */ | |
10 | #define DQUOTE_INLINE_H | |
11 | ||
12 | /* | |
13 | - regcurly - a little FSA that accepts {\d+,?\d*} | |
14 | Pulled from reg.c. | |
15 | */ | |
16 | PERL_STATIC_INLINE I32 | |
17 | S_regcurly(const char *s) | |
18 | { | |
19 | PERL_ARGS_ASSERT_REGCURLY; | |
20 | ||
21 | if (*s++ != '{') | |
22 | return FALSE; | |
23 | if (!isDIGIT(*s)) | |
24 | return FALSE; | |
25 | while (isDIGIT(*s)) | |
26 | s++; | |
27 | if (*s == ',') { | |
28 | s++; | |
29 | while (isDIGIT(*s)) | |
30 | s++; | |
31 | } | |
32 | ||
33 | return *s == '}'; | |
34 | } | |
35 | ||
36 | PERL_STATIC_INLINE bool | |
37 | S_grok_bslash_x(pTHX_ char **s, UV *uv, const char** error_msg, | |
38 | const bool output_warning, const bool strict, | |
39 | const bool silence_non_portable, | |
40 | const bool UTF) | |
41 | { | |
42 | ||
43 | /* Documentation to be supplied when interface nailed down finally | |
44 | * This returns FALSE if there is an error which the caller need not recover | |
45 | * from; otherwise TRUE. | |
46 | * It guarantees that the returned codepoint, *uv, when expressed as | |
47 | * utf8 bytes, would fit within the skipped "\x{...}" bytes. | |
48 | * | |
49 | * On input: | |
50 | * s is the address of a pointer to a NULL terminated string that begins | |
51 | * with 'x', and the previous character was a backslash. At exit, *s | |
52 | * will be advanced to the byte just after those absorbed by this | |
53 | * function. Hence the caller can continue parsing from there. In | |
54 | * the case of an error, this routine has generally positioned *s to | |
55 | * point just to the right of the first bad spot, so that a message | |
56 | * that has a "<--" to mark the spot will be correctly positioned. | |
57 | * uv points to a UV that will hold the output value, valid only if the | |
58 | * return from the function is TRUE | |
59 | * error_msg is a pointer that will be set to an internal buffer giving an | |
60 | * error message upon failure (the return is FALSE). Untouched if | |
61 | * function succeeds | |
62 | * output_warning says whether to output any warning messages, or suppress | |
63 | * them | |
64 | * strict is true if anything out of the ordinary should cause this to | |
65 | * fail instead of warn or be silent. For example, it requires | |
66 | * exactly 2 digits following the \x (when there are no braces). | |
67 | * 3 digits could be a mistake, so is forbidden in this mode. | |
68 | * silence_non_portable is true if to suppress warnings about the code | |
69 | * point returned being too large to fit on all platforms. | |
70 | * UTF is true iff the string *s is encoded in UTF-8. | |
71 | */ | |
72 | char* e; | |
73 | STRLEN numbers_len; | |
74 | I32 flags = PERL_SCAN_DISALLOW_PREFIX; | |
75 | #ifdef DEBUGGING | |
76 | char *start = *s - 1; | |
77 | assert(*start == '\\'); | |
78 | #endif | |
79 | ||
80 | PERL_ARGS_ASSERT_GROK_BSLASH_X; | |
81 | ||
82 | assert(**s == 'x'); | |
83 | (*s)++; | |
84 | ||
85 | if (strict || ! output_warning) { | |
86 | flags |= PERL_SCAN_SILENT_ILLDIGIT; | |
87 | } | |
88 | ||
89 | if (**s != '{') { | |
90 | STRLEN len = (strict) ? 3 : 2; | |
91 | ||
92 | *uv = grok_hex(*s, &len, &flags, NULL); | |
93 | *s += len; | |
94 | if (strict && len != 2) { | |
95 | if (len < 2) { | |
96 | *s += (UTF) ? UTF8SKIP(*s) : 1; | |
97 | *error_msg = "Non-hex character"; | |
98 | } | |
99 | else { | |
100 | *error_msg = "Use \\x{...} for more than two hex characters"; | |
101 | } | |
102 | return FALSE; | |
103 | } | |
104 | goto ok; | |
105 | } | |
106 | ||
107 | e = strchr(*s, '}'); | |
108 | if (!e) { | |
109 | (*s)++; /* Move past the '{' */ | |
110 | while (isXDIGIT(**s)) { /* Position beyond the legal digits */ | |
111 | (*s)++; | |
112 | } | |
113 | /* XXX The corresponding message above for \o is just '\\o{'; other | |
114 | * messages for other constructs include the '}', so are inconsistent. | |
115 | */ | |
116 | *error_msg = "Missing right brace on \\x{}"; | |
117 | return FALSE; | |
118 | } | |
119 | ||
120 | (*s)++; /* Point to expected first digit (could be first byte of utf8 | |
121 | sequence if not a digit) */ | |
122 | numbers_len = e - *s; | |
123 | if (numbers_len == 0) { | |
124 | if (strict) { | |
125 | (*s)++; /* Move past the } */ | |
126 | *error_msg = "Number with no digits"; | |
127 | return FALSE; | |
128 | } | |
129 | *s = e + 1; | |
130 | *uv = 0; | |
131 | goto ok; | |
132 | } | |
133 | ||
134 | flags |= PERL_SCAN_ALLOW_UNDERSCORES; | |
135 | if (silence_non_portable) { | |
136 | flags |= PERL_SCAN_SILENT_NON_PORTABLE; | |
137 | } | |
138 | ||
139 | *uv = grok_hex(*s, &numbers_len, &flags, NULL); | |
140 | /* Note that if has non-hex, will ignore everything starting with that up | |
141 | * to the '}' */ | |
142 | ||
143 | if (strict && numbers_len != (STRLEN) (e - *s)) { | |
144 | *s += numbers_len; | |
145 | *s += (UTF) ? UTF8SKIP(*s) : 1; | |
146 | *error_msg = "Non-hex character"; | |
147 | return FALSE; | |
148 | } | |
149 | ||
150 | /* Return past the '}' */ | |
151 | *s = e + 1; | |
152 | ||
153 | ok: | |
154 | /* guarantee replacing "\x{...}" with utf8 bytes fits within | |
155 | * existing space */ | |
156 | assert(OFFUNISKIP(*uv) < *s - start); | |
157 | return TRUE; | |
158 | } | |
159 | ||
160 | #endif /* DQUOTE_INLINE_H */ |