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-rw-r--r--stdio-common/printf-parse.h388
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diff --git a/stdio-common/printf-parse.h b/stdio-common/printf-parse.h
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+/* Internal header for parsing printf format strings.
+Copyright (C) 1995 Free Software Foundation, Inc.
+This file is part of th GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ctype.h>
+#include <printf.h>
+#include <string.h>
+#include <stddef.h>
+
+#define NDEBUG 1
+#include <assert.h>
+
+#define MAX(a,b) ({typeof(a) _a = (a); typeof(b) _b = (b); \
+ _a > _b ? _a : _b; })
+#define MIN(a,b) ({typeof(a) _a = (a); typeof(b) _b = (b); \
+ _a < _b ? _a : _b; })
+
+struct printf_spec
+ {
+ /* Information parsed from the format spec. */
+ struct printf_info info;
+
+ /* Pointers into the format string for the end of this format
+ spec and the next (or to the end of the string if no more). */
+ const char *end_of_fmt, *next_fmt;
+
+ /* Position of arguments for precision and width, or -1 if `info' has
+ the constant value. */
+ int prec_arg, width_arg;
+
+ int data_arg; /* Position of data argument. */
+ int data_arg_type; /* Type of first argument. */
+ /* Number of arguments consumed by this format specifier. */
+ size_t ndata_args;
+ };
+
+
+/* The various kinds off arguments that can be passed to printf. */
+union printf_arg
+ {
+ unsigned char pa_char;
+ short int pa_short_int;
+ int pa_int;
+ long int pa_long_int;
+ long long int pa_long_long_int;
+ unsigned short int pa_u_short_int;
+ unsigned int pa_u_int;
+ unsigned long int pa_u_long_int;
+ unsigned long long int pa_u_long_long_int;
+ float pa_float;
+ double pa_double;
+ long double pa_long_double;
+ const char *pa_string;
+ void *pa_pointer;
+ };
+
+
+/* Read a simple integer from a string and update the string pointer.
+ It is assumed that the first character is a digit. */
+static inline unsigned int
+read_int (const char * *pstr)
+{
+ unsigned int retval = **pstr - '0';
+
+ while (isdigit (*++(*pstr)))
+ {
+ retval *= 10;
+ retval += **pstr - '0';
+ }
+
+ return retval;
+}
+
+
+
+/* Find the next spec in FORMAT, or the end of the string. Returns
+ a pointer into FORMAT, to a '%' or a '\0'. */
+static inline const char *
+find_spec (const char *format)
+{
+ while (*format != '\0' && *format != '%')
+ {
+ int len;
+
+ if (isascii (*format) || (len = mblen (format, MB_CUR_MAX)) <= 0)
+ ++format;
+ else
+ format += len;
+ }
+ return format;
+}
+
+
+/* This is defined in reg-printf.c. */
+extern printf_arginfo_function **__printf_arginfo_table;
+
+
+/* FORMAT must point to a '%' at the beginning of a spec. Fills in *SPEC
+ with the parsed details. POSN is the number of arguments already
+ consumed. At most MAXTYPES - POSN types are filled in TYPES. Return
+ the number of args consumed by this spec; *MAX_REF_ARG is updated so it
+ remains the highest argument index used. */
+static inline size_t
+parse_one_spec (const char *format, size_t posn, struct printf_spec *spec,
+ size_t *max_ref_arg)
+{
+ unsigned int n;
+ size_t nargs = 0;
+
+ /* Skip the '%'. */
+ ++format;
+
+ /* Clear information structure. */
+ spec->data_arg = -1;
+ spec->info.alt = 0;
+ spec->info.space = 0;
+ spec->info.left = 0;
+ spec->info.showsign = 0;
+ spec->info.group = 0;
+ spec->info.pad = ' ';
+
+ /* Test for positional argument. */
+ if (isdigit (*format))
+ {
+ const char *begin = format;
+
+ n = read_int (&format);
+
+ if (n > 0 && *format == '$')
+ /* Is positional parameter. */
+ {
+ ++format; /* Skip the '$'. */
+ spec->data_arg = n - 1;
+ *max_ref_arg = MAX (*max_ref_arg, n);
+ }
+ else
+ /* Oops; that was actually the width and/or 0 padding flag.
+ Step back and read it again. */
+ format = begin;
+ }
+
+ /* Check for spec modifiers. */
+ while (*format == ' ' || *format == '+' || *format == '-' ||
+ *format == '#' || *format == '0' || *format == '\'')
+ switch (*format++)
+ {
+ case ' ':
+ /* Output a space in place of a sign, when there is no sign. */
+ spec->info.space = 1;
+ break;
+ case '+':
+ /* Always output + or - for numbers. */
+ spec->info.showsign = 1;
+ break;
+ case '-':
+ /* Left-justify things. */
+ spec->info.left = 1;
+ break;
+ case '#':
+ /* Use the "alternate form":
+ Hex has 0x or 0X, FP always has a decimal point. */
+ spec->info.alt = 1;
+ break;
+ case '0':
+ /* Pad with 0s. */
+ spec->info.pad = '0';
+ break;
+ case '\'':
+ /* Show grouping in numbers if the locale information
+ indicates any. */
+ spec->info.group = 1;
+ break;
+ }
+ if (spec->info.left)
+ spec->info.pad = ' ';
+
+ /* Get the field width. */
+ spec->width_arg = -1;
+ spec->info.width = 0;
+ if (*format == '*')
+ {
+ /* The field width is given in an argument.
+ A negative field width indicates left justification. */
+ const char *begin = ++format;
+
+ if (isdigit (*format))
+ {
+ /* The width argument might be found in a positional parameter. */
+ n = read_int (&format);
+
+ if (n > 0 && *format == '$')
+ {
+ spec->width_arg = n - 1;
+ *max_ref_arg = MAX (*max_ref_arg, n);
+ ++format; /* Skip '$'. */
+ }
+ }
+
+ if (spec->width_arg < 0)
+ {
+ /* Not in a positional parameter. Consume one argument. */
+ spec->width_arg = posn++;
+ ++nargs;
+ format = begin; /* Step back and reread. */
+ }
+ }
+ else if (isdigit (*format))
+ /* Constant width specification. */
+ spec->info.width = read_int (&format);
+
+ /* Get the precision. */
+ spec->prec_arg = -1;
+ /* -1 means none given; 0 means explicit 0. */
+ spec->info.prec = -1;
+ if (*format == '.')
+ {
+ ++format;
+ if (*format == '*')
+ {
+ /* The precision is given in an argument. */
+ const char *begin = ++format;
+
+ if (isdigit (*format))
+ {
+ n = read_int (&format);
+
+ if (n > 0 && *format == '$')
+ {
+ spec->prec_arg = n - 1;
+ *max_ref_arg = MAX (*max_ref_arg, n);
+ ++format;
+ }
+ }
+
+ if (spec->prec_arg < 0)
+ {
+ /* Not in a positional parameter. */
+ spec->prec_arg = posn++;
+ ++nargs;
+ format = begin;
+ }
+ }
+ else if (isdigit (*format))
+ spec->info.prec = read_int (&format);
+ else
+ /* "%.?" is treated like "%.0?". */
+ spec->info.prec = 0;
+
+ /* If there was a precision specified, ignore the 0 flag and always
+ pad with spaces. */
+ spec->info.pad = ' ';
+ }
+
+ /* Check for type modifiers. */
+#define is_longlong is_long_double
+ spec->info.is_long_double = 0;
+ spec->info.is_short = 0;
+ spec->info.is_long = 0;
+
+ while (*format == 'h' || *format == 'l' || *format == 'L' ||
+ *format == 'Z' || *format == 'q')
+ switch (*format++)
+ {
+ case 'h':
+ /* int's are short int's. */
+ spec->info.is_short = 1;
+ break;
+ case 'l':
+ if (spec->info.is_long)
+ /* A double `l' is equivalent to an `L'. */
+ spec->info.is_longlong = 1;
+ else
+ /* int's are long int's. */
+ spec->info.is_long = 1;
+ break;
+ case 'L':
+ /* double's are long double's, and int's are long long int's. */
+ spec->info.is_long_double = 1;
+ break;
+ case 'Z':
+ /* int's are size_t's. */
+ assert (sizeof(size_t) <= sizeof(unsigned long long int));
+ spec->info.is_longlong = sizeof(size_t) > sizeof(unsigned long int);
+ spec->info.is_long = sizeof(size_t) > sizeof(unsigned int);
+ break;
+ case 'q':
+ /* 4.4 uses this for long long. */
+ spec->info.is_longlong = 1;
+ break;
+ }
+
+ /* Get the format specification. */
+ spec->info.spec = *format++;
+ if (__printf_arginfo_table != NULL &&
+ __printf_arginfo_table[spec->info.spec] != NULL)
+ /* We don't try to get the types for all arguments if the format
+ uses more than one. The normal case is covered though. */
+ spec->ndata_args = (*__printf_arginfo_table[spec->info.spec])
+ (&spec->info, 1, &spec->data_arg_type);
+ else
+ {
+ /* Find the data argument types of a built-in spec. */
+ spec->ndata_args = 1;
+
+ switch (spec->info.spec)
+ {
+ case 'i':
+ case 'd':
+ case 'u':
+ case 'o':
+ case 'X':
+ case 'x':
+ if (spec->info.is_longlong)
+ spec->data_arg_type = PA_INT|PA_FLAG_LONG_LONG;
+ else if (spec->info.is_long)
+ spec->data_arg_type = PA_INT|PA_FLAG_LONG;
+ else if (spec->info.is_short)
+ spec->data_arg_type = PA_INT|PA_FLAG_SHORT;
+ else
+ spec->data_arg_type = PA_INT;
+ break;
+ case 'e':
+ case 'E':
+ case 'f':
+ case 'g':
+ case 'G':
+ if (spec->info.is_long_double)
+ spec->data_arg_type = PA_DOUBLE|PA_FLAG_LONG_DOUBLE;
+ else
+ spec->data_arg_type = PA_DOUBLE;
+ break;
+ case 'c':
+ spec->data_arg_type = PA_CHAR;
+ break;
+ case 's':
+ spec->data_arg_type = PA_STRING;
+ break;
+ case 'p':
+ spec->data_arg_type = PA_POINTER;
+ break;
+ case 'n':
+ spec->data_arg_type = PA_INT|PA_FLAG_PTR;
+ break;
+
+ case 'm':
+ default:
+ /* An unknown spec will consume no args. */
+ spec->ndata_args = 0;
+ break;
+ }
+
+ if (spec->data_arg == -1 && spec->ndata_args > 0)
+ {
+ /* There are args consumed, but no positional spec.
+ Use the next sequential arg position. */
+ spec->data_arg = posn;
+ posn += spec->ndata_args;
+ nargs += spec->ndata_args;
+ }
+ }
+
+ if (spec->info.spec == '\0')
+ /* Format ended before this spec was complete. */
+ spec->end_of_fmt = spec->next_fmt = format - 1;
+ else
+ {
+ /* Find the next format spec. */
+ spec->end_of_fmt = format;
+ spec->next_fmt = find_spec (format);
+ }
+
+ return nargs;
+}
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