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
|
/* dquote.c
*
* This file contains functions that are related to
* parsing double-quotish expressions.
*
*/
#include "EXTERN.h"
#define PERL_IN_DQUOTE_C
#include "perl.h"
/* XXX Add documentation after final interface and behavior is decided */
/* May want to show context for error, so would pass S_grok_bslash_c(pTHX_ const char* current, const char* start, const bool output_warning)
U8 source = *current;
*/
char
Perl_grok_bslash_c(pTHX_ const char source, const bool output_warning)
{
U8 result;
if (! isPRINT_A(source)) {
Perl_croak(aTHX_ "%s",
"Character following \"\\c\" must be printable ASCII");
}
else if (source == '{') {
const char control = toCTRL('{');
if (isPRINT_A(control)) {
/* diag_listed_as: Use "%s" instead of "%s" */
Perl_croak(aTHX_ "Use \"%c\" instead of \"\\c{\"", control);
}
else {
Perl_croak(aTHX_ "Sequence \"\\c{\" invalid");
}
}
result = toCTRL(source);
if (output_warning && isPRINT_A(result)) {
U8 clearer[3];
U8 i = 0;
if (! isWORDCHAR(result)) {
clearer[i++] = '\\';
}
clearer[i++] = result;
clearer[i++] = '\0';
Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
"\"\\c%c\" is more clearly written simply as \"%s\"",
source,
clearer);
}
return result;
}
bool
Perl_grok_bslash_o(pTHX_ char **s, UV *uv, const char** error_msg,
const bool output_warning, const bool strict,
const bool silence_non_portable,
const bool UTF)
{
/* Documentation to be supplied when interface nailed down finally
* This returns FALSE if there is an error which the caller need not recover
* from; otherwise TRUE. In either case the caller should look at *len [???].
* It guarantees that the returned codepoint, *uv, when expressed as
* utf8 bytes, would fit within the skipped "\o{...}" bytes.
* On input:
* s is the address of a pointer to a NULL terminated string that begins
* with 'o', and the previous character was a backslash. At exit, *s
* will be advanced to the byte just after those absorbed by this
* function. Hence the caller can continue parsing from there. In
* the case of an error, this routine has generally positioned *s to
* point just to the right of the first bad spot, so that a message
* that has a "<--" to mark the spot will be correctly positioned.
* uv points to a UV that will hold the output value, valid only if the
* return from the function is TRUE
* error_msg is a pointer that will be set to an internal buffer giving an
* error message upon failure (the return is FALSE). Untouched if
* function succeeds
* output_warning says whether to output any warning messages, or suppress
* them
* strict is true if this should fail instead of warn if there are
* non-octal digits within the braces
* silence_non_portable is true if to suppress warnings about the code
* point returned being too large to fit on all platforms.
* UTF is true iff the string *s is encoded in UTF-8.
*/
char* e;
STRLEN numbers_len;
I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
| PERL_SCAN_DISALLOW_PREFIX
/* XXX Until the message is improved in grok_oct, handle errors
* ourselves */
| PERL_SCAN_SILENT_ILLDIGIT;
#ifdef DEBUGGING
char *start = *s - 1;
assert(*start == '\\');
#endif
PERL_ARGS_ASSERT_GROK_BSLASH_O;
assert(**s == 'o');
(*s)++;
if (**s != '{') {
*error_msg = "Missing braces on \\o{}";
return FALSE;
}
e = strchr(*s, '}');
if (!e) {
(*s)++; /* Move past the '{' */
while (isOCTAL(**s)) { /* Position beyond the legal digits */
(*s)++;
}
*error_msg = "Missing right brace on \\o{";
return FALSE;
}
(*s)++; /* Point to expected first digit (could be first byte of utf8
sequence if not a digit) */
numbers_len = e - *s;
if (numbers_len == 0) {
(*s)++; /* Move past the } */
*error_msg = "Number with no digits";
return FALSE;
}
if (silence_non_portable) {
flags |= PERL_SCAN_SILENT_NON_PORTABLE;
}
*uv = grok_oct(*s, &numbers_len, &flags, NULL);
/* Note that if has non-octal, will ignore everything starting with that up
* to the '}' */
if (numbers_len != (STRLEN) (e - *s)) {
if (strict) {
*s += numbers_len;
*s += (UTF) ? UTF8SKIP(*s) : (STRLEN) 1;
*error_msg = "Non-octal character";
return FALSE;
}
else if (output_warning) {
Perl_ck_warner(aTHX_ packWARN(WARN_DIGIT),
/* diag_listed_as: Non-octal character '%c'. Resolved as "%s" */
"Non-octal character '%c'. Resolved as \"\\o{%.*s}\"",
*(*s + numbers_len),
(int) numbers_len,
*s);
}
}
/* Return past the '}' */
*s = e + 1;
return TRUE;
}
char*
Perl_form_short_octal_warning(pTHX_
const char * const s, /* Points to first non-octal */
const STRLEN len /* Length of octals string, so
(s-len) points to first
octal */
) {
/* Return a character string consisting of a warning message for when a
* string constant in octal is weird, like "\078". */
const char * sans_leading_zeros = s - len;
PERL_ARGS_ASSERT_FORM_SHORT_OCTAL_WARNING;
assert(*s == '8' || *s == '9');
/* Remove the leading zeros, retaining one zero so won't be zero length */
while (*sans_leading_zeros == '0') sans_leading_zeros++;
if (sans_leading_zeros == s) {
sans_leading_zeros--;
}
return Perl_form(aTHX_
"'%.*s' resolved to '\\o{%.*s}%c'",
(int) (len + 2), s - len - 1,
(int) (s - sans_leading_zeros), sans_leading_zeros,
*s);
}
/*
* ex: set ts=8 sts=4 sw=4 et:
*/
|
