1 files changed, 388 insertions, 0 deletions

diff --git a/stdio/printf-parse.h b/stdio/printf-parse.h
new file mode 100644
index 0000000..0f6e9e2
--- /dev/null
+++ b/stdio/printf-parse.h
@@ -0,0 +1,388 @@
+/* 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;
+}