| 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 | return TRUE; |
| 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 | return TRUE; |
| 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 | return TRUE; |
| 154 | } |
| 155 | |
| 156 | #endif /* DQUOTE_INLINE_H */ |