1 /* Internal header for parsing printf format strings.
2 Copyright (C) 1995, 1996, 1997 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 Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
31 /* Information parsed from the format spec. */
32 struct printf_info info;
34 /* Pointers into the format string for the end of this format
35 spec and the next (or to the end of the string if no more). */
36 const char *end_of_fmt, *next_fmt;
38 /* Position of arguments for precision and width, or -1 if `info' has
39 the constant value. */
40 int prec_arg, width_arg;
42 int data_arg; /* Position of data argument. */
43 int data_arg_type; /* Type of first argument. */
44 /* Number of arguments consumed by this format specifier. */
49 /* The various kinds off arguments that can be passed to printf. */
52 unsigned char pa_char;
54 short int pa_short_int;
57 long long int pa_long_long_int;
58 unsigned short int pa_u_short_int;
59 unsigned int pa_u_int;
60 unsigned long int pa_u_long_int;
61 unsigned long long int pa_u_long_long_int;
64 long double pa_long_double;
65 const char *pa_string;
66 const wchar_t *pa_wstring;
71 /* Read a simple integer from a string and update the string pointer.
72 It is assumed that the first character is a digit. */
73 static inline unsigned int
74 read_int (const UCHAR_T * *pstr)
76 unsigned int retval = **pstr - L_('0');
78 while (ISDIGIT (*++(*pstr)))
81 retval += **pstr - L_('0');
89 /* Find the next spec in FORMAT, or the end of the string. Returns
90 a pointer into FORMAT, to a '%' or a '\0'. */
91 static inline const char *
92 find_spec (const char *format, mbstate_t *ps)
94 while (*format != '\0' && *format != '%')
98 /* Remove any hints of a wrong encoding. */
100 if (isascii (*format) || (len = mbrlen (format, MB_CUR_MAX, ps)) <= 0)
109 /* These are defined in reg-printf.c. */
110 extern printf_arginfo_function *__printf_arginfo_table[];
111 extern printf_function **__printf_function_table;
114 /* FORMAT must point to a '%' at the beginning of a spec. Fills in *SPEC
115 with the parsed details. POSN is the number of arguments already
116 consumed. At most MAXTYPES - POSN types are filled in TYPES. Return
117 the number of args consumed by this spec; *MAX_REF_ARG is updated so it
118 remains the highest argument index used. */
120 parse_one_spec (const UCHAR_T *format, size_t posn, struct printf_spec *spec,
121 size_t *max_ref_arg, mbstate_t *ps)
129 /* Clear information structure. */
132 spec->info.space = 0;
134 spec->info.showsign = 0;
135 spec->info.group = 0;
136 spec->info.pad = ' ';
138 /* Test for positional argument. */
139 if (ISDIGIT (*format))
141 const UCHAR_T *begin = format;
143 n = read_int (&format);
145 if (n > 0 && *format == L_('$'))
146 /* Is positional parameter. */
148 ++format; /* Skip the '$'. */
149 spec->data_arg = n - 1;
150 *max_ref_arg = MAX (*max_ref_arg, n);
153 /* Oops; that was actually the width and/or 0 padding flag.
154 Step back and read it again. */
158 /* Check for spec modifiers. */
159 while (*format == L_(' ') || *format == L_('+') || *format == L_('-') ||
160 *format == L_('#') || *format == L_('0') || *format == L_('\''))
164 /* Output a space in place of a sign, when there is no sign. */
165 spec->info.space = 1;
168 /* Always output + or - for numbers. */
169 spec->info.showsign = 1;
172 /* Left-justify things. */
176 /* Use the "alternate form":
177 Hex has 0x or 0X, FP always has a decimal point. */
182 spec->info.pad = '0';
185 /* Show grouping in numbers if the locale information
187 spec->info.group = 1;
191 spec->info.pad = ' ';
193 /* Get the field width. */
194 spec->width_arg = -1;
195 spec->info.width = 0;
196 if (*format == L_('*'))
198 /* The field width is given in an argument.
199 A negative field width indicates left justification. */
200 const UCHAR_T *begin = ++format;
202 if (ISDIGIT (*format))
204 /* The width argument might be found in a positional parameter. */
205 n = read_int (&format);
207 if (n > 0 && *format == L_('$'))
209 spec->width_arg = n - 1;
210 *max_ref_arg = MAX (*max_ref_arg, n);
211 ++format; /* Skip '$'. */
215 if (spec->width_arg < 0)
217 /* Not in a positional parameter. Consume one argument. */
218 spec->width_arg = posn++;
220 format = begin; /* Step back and reread. */
223 else if (ISDIGIT (*format))
224 /* Constant width specification. */
225 spec->info.width = read_int (&format);
227 /* Get the precision. */
229 /* -1 means none given; 0 means explicit 0. */
230 spec->info.prec = -1;
231 if (*format == L_('.'))
234 if (*format == L_('*'))
236 /* The precision is given in an argument. */
237 const UCHAR_T *begin = ++format;
239 if (ISDIGIT (*format))
241 n = read_int (&format);
243 if (n > 0 && *format == L_('$'))
245 spec->prec_arg = n - 1;
246 *max_ref_arg = MAX (*max_ref_arg, n);
251 if (spec->prec_arg < 0)
253 /* Not in a positional parameter. */
254 spec->prec_arg = posn++;
259 else if (ISDIGIT (*format))
260 spec->info.prec = read_int (&format);
262 /* "%.?" is treated like "%.0?". */
266 /* Check for type modifiers. */
267 #define is_longlong is_long_double
268 spec->info.is_long_double = 0;
269 spec->info.is_short = 0;
270 spec->info.is_long = 0;
272 if (*format == L_('h') || *format == L_('l') || *format == L_('L') ||
273 *format == L_('Z') || *format == L_('q'))
277 /* int's are short int's. */
278 spec->info.is_short = 1;
281 /* int's are long int's. */
282 spec->info.is_long = 1;
283 if (*format != L_('l'))
288 /* double's are long double's, and int's are long long int's. */
290 /* 4.4 uses this for long long. */
291 spec->info.is_long_double = 1;
294 /* int's are size_t's. */
295 assert (sizeof(size_t) <= sizeof(unsigned long long int));
296 spec->info.is_longlong = sizeof(size_t) > sizeof(unsigned long int);
297 spec->info.is_long = sizeof(size_t) > sizeof(unsigned int);
301 /* Get the format specification. */
302 spec->info.spec = (wchar_t) *format++;
303 if (__printf_function_table != NULL
304 && spec->info.spec <= UCHAR_MAX
305 && __printf_arginfo_table[spec->info.spec] != NULL)
306 /* We don't try to get the types for all arguments if the format
307 uses more than one. The normal case is covered though. */
308 spec->ndata_args = (*__printf_arginfo_table[spec->info.spec])
309 (&spec->info, 1, &spec->data_arg_type);
312 /* Find the data argument types of a built-in spec. */
313 spec->ndata_args = 1;
315 switch (spec->info.spec)
323 if (spec->info.is_longlong)
324 spec->data_arg_type = PA_INT|PA_FLAG_LONG_LONG;
325 else if (spec->info.is_long)
326 spec->data_arg_type = PA_INT|PA_FLAG_LONG;
327 else if (spec->info.is_short)
328 spec->data_arg_type = PA_INT|PA_FLAG_SHORT;
330 spec->data_arg_type = PA_INT;
337 if (spec->info.is_long_double)
338 spec->data_arg_type = PA_DOUBLE|PA_FLAG_LONG_DOUBLE;
340 spec->data_arg_type = PA_DOUBLE;
343 spec->data_arg_type = PA_CHAR;
346 spec->data_arg_type = PA_WCHAR;
349 spec->data_arg_type = PA_STRING;
352 spec->data_arg_type = PA_WSTRING;
355 spec->data_arg_type = PA_POINTER;
358 spec->data_arg_type = PA_INT|PA_FLAG_PTR;
363 /* An unknown spec will consume no args. */
364 spec->ndata_args = 0;
369 if (spec->data_arg == -1 && spec->ndata_args > 0)
371 /* There are args consumed, but no positional spec. Use the
372 next sequential arg position. */
373 spec->data_arg = posn;
374 nargs += spec->ndata_args;
377 if (spec->info.spec == L'\0')
378 /* Format ended before this spec was complete. */
379 spec->end_of_fmt = spec->next_fmt = format - 1;
382 /* Find the next format spec. */
383 spec->end_of_fmt = format;
384 spec->next_fmt = find_spec (format, ps);