1 /* Helper functions for parsing printf format strings.
2 Copyright (C) 1995-2000,2002-2004,2006,2009 Free Software Foundation, Inc.
3 This file is part of th GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
23 #include <sys/param.h>
27 #ifndef COMPILE_WPRINTF
29 # define UCHAR_T unsigned char
32 # define ISDIGIT(Ch) isdigit (Ch)
33 # define HANDLE_REGISTERED_MODIFIER __handle_registered_modifier_mb
35 # define CHAR_T wchar_t
36 # define UCHAR_T unsigned int
38 # define L_(Str) L##Str
39 # define ISDIGIT(Ch) iswdigit (Ch)
40 # define HANDLE_REGISTERED_MODIFIER __handle_registered_modifier_wc
43 #include "printf-parse.h"
50 /* FORMAT must point to a '%' at the beginning of a spec. Fills in *SPEC
51 with the parsed details. POSN is the number of arguments already
52 consumed. At most MAXTYPES - POSN types are filled in TYPES. Return
53 the number of args consumed by this spec; *MAX_REF_ARG is updated so it
54 remains the highest argument index used. */
57 #ifdef COMPILE_WPRINTF
58 __parse_one_specwc (const UCHAR_T *format, size_t posn,
59 struct printf_spec *spec, size_t *max_ref_arg)
61 __parse_one_specmb (const UCHAR_T *format, size_t posn,
62 struct printf_spec *spec, size_t *max_ref_arg)
71 /* Clear information structure. */
76 spec->info.showsign = 0;
81 spec->info.wide = sizeof (UCHAR_T) > 1;
83 /* Test for positional argument. */
84 if (ISDIGIT (*format))
86 const UCHAR_T *begin = format;
88 n = read_int (&format);
90 if (n > 0 && *format == L_('$'))
91 /* Is positional parameter. */
93 ++format; /* Skip the '$'. */
94 spec->data_arg = n - 1;
95 *max_ref_arg = MAX (*max_ref_arg, n);
98 /* Oops; that was actually the width and/or 0 padding flag.
99 Step back and read it again. */
103 /* Check for spec modifiers. */
109 /* Output a space in place of a sign, when there is no sign. */
110 spec->info.space = 1;
113 /* Always output + or - for numbers. */
114 spec->info.showsign = 1;
117 /* Left-justify things. */
121 /* Use the "alternate form":
122 Hex has 0x or 0X, FP always has a decimal point. */
127 spec->info.pad = '0';
130 /* Show grouping in numbers if the locale information
132 spec->info.group = 1;
135 /* Use the internationalized form of the output. Currently
136 means to use the `outdigits' of the current locale. */
147 spec->info.pad = ' ';
149 /* Get the field width. */
150 spec->width_arg = -1;
151 spec->info.width = 0;
152 if (*format == L_('*'))
154 /* The field width is given in an argument.
155 A negative field width indicates left justification. */
156 const UCHAR_T *begin = ++format;
158 if (ISDIGIT (*format))
160 /* The width argument might be found in a positional parameter. */
161 n = read_int (&format);
163 if (n > 0 && *format == L_('$'))
165 spec->width_arg = n - 1;
166 *max_ref_arg = MAX (*max_ref_arg, n);
167 ++format; /* Skip '$'. */
171 if (spec->width_arg < 0)
173 /* Not in a positional parameter. Consume one argument. */
174 spec->width_arg = posn++;
176 format = begin; /* Step back and reread. */
179 else if (ISDIGIT (*format))
180 /* Constant width specification. */
181 spec->info.width = read_int (&format);
183 /* Get the precision. */
185 /* -1 means none given; 0 means explicit 0. */
186 spec->info.prec = -1;
187 if (*format == L_('.'))
190 if (*format == L_('*'))
192 /* The precision is given in an argument. */
193 const UCHAR_T *begin = ++format;
195 if (ISDIGIT (*format))
197 n = read_int (&format);
199 if (n > 0 && *format == L_('$'))
201 spec->prec_arg = n - 1;
202 *max_ref_arg = MAX (*max_ref_arg, n);
207 if (spec->prec_arg < 0)
209 /* Not in a positional parameter. */
210 spec->prec_arg = posn++;
215 else if (ISDIGIT (*format))
216 spec->info.prec = read_int (&format);
218 /* "%.?" is treated like "%.0?". */
222 /* Check for type modifiers. */
223 spec->info.is_long_double = 0;
224 spec->info.is_short = 0;
225 spec->info.is_long = 0;
226 spec->info.is_char = 0;
229 if (__builtin_expect (__printf_modifier_table == NULL, 1)
230 || __printf_modifier_table[*format] == NULL
231 || HANDLE_REGISTERED_MODIFIER (&format, &spec->info) != 0)
235 /* ints are short ints or chars. */
236 if (*format != L_('h'))
237 spec->info.is_short = 1;
241 spec->info.is_char = 1;
245 /* ints are long ints. */
246 spec->info.is_long = 1;
247 if (*format != L_('l'))
252 /* doubles are long doubles, and ints are long long ints. */
254 /* 4.4 uses this for long long. */
255 spec->info.is_long_double = 1;
259 /* ints are size_ts. */
260 assert (sizeof (size_t) <= sizeof (unsigned long long int));
261 #if LONG_MAX != LONG_LONG_MAX
262 spec->info.is_long_double = (sizeof (size_t)
263 > sizeof (unsigned long int));
265 spec->info.is_long = sizeof (size_t) > sizeof (unsigned int);
268 assert (sizeof (ptrdiff_t) <= sizeof (long long int));
269 #if LONG_MAX != LONG_LONG_MAX
270 spec->info.is_long_double = (sizeof (ptrdiff_t) > sizeof (long int));
272 spec->info.is_long = sizeof (ptrdiff_t) > sizeof (int);
275 assert (sizeof (uintmax_t) <= sizeof (unsigned long long int));
276 #if LONG_MAX != LONG_LONG_MAX
277 spec->info.is_long_double = (sizeof (uintmax_t)
278 > sizeof (unsigned long int));
280 spec->info.is_long = sizeof (uintmax_t) > sizeof (unsigned int);
283 /* Not a recognized modifier. Backup. */
288 /* Get the format specification. */
289 spec->info.spec = (wchar_t) *format++;
291 if (__builtin_expect (__printf_function_table == NULL, 1)
292 || spec->info.spec > UCHAR_MAX
293 || __printf_arginfo_table[spec->info.spec] == NULL
294 /* We don't try to get the types for all arguments if the format
295 uses more than one. The normal case is covered though. If
296 the call returns -1 we continue with the normal specifiers. */
297 || (int) (spec->ndata_args = (*__printf_arginfo_table[spec->info.spec])
298 (&spec->info, 1, &spec->data_arg_type,
301 /* Find the data argument types of a built-in spec. */
302 spec->ndata_args = 1;
304 switch (spec->info.spec)
312 #if LONG_MAX != LONG_LONG_MAX
313 if (spec->info.is_long_double)
314 spec->data_arg_type = PA_INT|PA_FLAG_LONG_LONG;
317 if (spec->info.is_long)
318 spec->data_arg_type = PA_INT|PA_FLAG_LONG;
319 else if (spec->info.is_short)
320 spec->data_arg_type = PA_INT|PA_FLAG_SHORT;
321 else if (spec->info.is_char)
322 spec->data_arg_type = PA_CHAR;
324 spec->data_arg_type = PA_INT;
334 if (spec->info.is_long_double)
335 spec->data_arg_type = PA_DOUBLE|PA_FLAG_LONG_DOUBLE;
337 spec->data_arg_type = PA_DOUBLE;
340 spec->data_arg_type = PA_CHAR;
343 spec->data_arg_type = PA_WCHAR;
346 spec->data_arg_type = PA_STRING;
349 spec->data_arg_type = PA_WSTRING;
352 spec->data_arg_type = PA_POINTER;
355 spec->data_arg_type = PA_INT|PA_FLAG_PTR;
360 /* An unknown spec will consume no args. */
361 spec->ndata_args = 0;
366 if (spec->data_arg == -1 && spec->ndata_args > 0)
368 /* There are args consumed, but no positional spec. Use the
369 next sequential arg position. */
370 spec->data_arg = posn;
371 nargs += spec->ndata_args;
374 if (spec->info.spec == L'\0')
375 /* Format ended before this spec was complete. */
376 spec->end_of_fmt = spec->next_fmt = format - 1;
379 /* Find the next format spec. */
380 spec->end_of_fmt = format;
381 #ifdef COMPILE_WPRINTF
382 spec->next_fmt = __find_specwc (format);
384 spec->next_fmt = __find_specmb (format);