gstreamer/gst/printf/printf-parse.c

/* Formatted output to strings.
   Copyright (C) 1999-2000, 2002-2003 Free Software Foundation, Inc.

   This program 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, or (at your option)
   any later version.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "gst-printf.h"

/* Specification.  */
#include "printf-parse.h"

/* Get size_t, NULL.  */
#include <stddef.h>

/* Get intmax_t.  */
#ifdef HAVE_STDINT_H_WITH_UINTMAX
# include <stdint.h>
#endif
#ifdef HAVE_INTTYPES_H_WITH_UINTMAX
# include <inttypes.h>
#endif

/* malloc(), realloc(), free().  */
#include <stdlib.h>

#ifdef STATIC
STATIC
#endif
    int
printf_parse (const char *format, char_directives * d, arguments * a)
{
  const char *cp = format;      /* pointer into format */
  int arg_posn = 0;             /* number of regular arguments consumed */
  unsigned int d_allocated;     /* allocated elements of d->dir */
  unsigned int a_allocated;     /* allocated elements of a->arg */
  unsigned int max_width_length = 0;
  unsigned int max_precision_length = 0;

  d->count = 0;
  d_allocated = 1;
  d->dir = malloc (d_allocated * sizeof (char_directive));
  if (d->dir == NULL)
    /* Out of memory.  */
    return -1;

  a->count = 0;
  a_allocated = 0;
  a->arg = NULL;

#define REGISTER_ARG(_index_,_type_) \
  {									\
    unsigned int n = (_index_);						\
    if (n >= a_allocated)						\
      {									\
	argument *memory;						\
	a_allocated = 2 * a_allocated;					\
	if (a_allocated <= n)						\
	  a_allocated = n + 1;						\
	memory = (a->arg						\
		  ? realloc (a->arg, a_allocated * sizeof (argument))	\
		  : malloc (a_allocated * sizeof (argument)));		\
	if (memory == NULL)						\
	  /* Out of memory.  */						\
	  goto error;							\
	a->arg = memory;						\
      }									\
    while (a->count <= n) {                             \
      a->arg[a->count].type = TYPE_NONE;                \
      a->arg[a->count].ext_string = (char *) 0;         \
      ++a->count;                                       \
    }                                                   \
    if (a->arg[n].type == TYPE_NONE)					\
      a->arg[n].type = (_type_);					\
    else if (a->arg[n].type != (_type_))				\
      /* Ambiguous type for positional argument.  */			\
      goto error;							\
  }

  while (*cp != '\0') {
    char c = *cp++;
    if (c == '%') {
      int arg_index = -1;
      char_directive *dp = &d->dir[d->count];   /* pointer to next directive */

      /* Initialize the next directive.  */
      dp->dir_start = cp - 1;
      dp->flags = 0;
      dp->width_start = NULL;
      dp->width_end = NULL;
      dp->width_arg_index = -1;
      dp->precision_start = NULL;
      dp->precision_end = NULL;
      dp->precision_arg_index = -1;
      dp->arg_index = -1;

      /* Test for positional argument.  */
      if (*cp >= '0' && *cp <= '9') {
        const char *np;

        for (np = cp; *np >= '0' && *np <= '9'; np++);
        if (*np == '$') {
          unsigned int n = 0;

          for (np = cp; *np >= '0' && *np <= '9'; np++)
            n = 10 * n + (*np - '0');
          if (n == 0)
            /* Positional argument 0.  */
            goto error;
          arg_index = n - 1;
          cp = np + 1;
        }
      }

      /* Read the flags.  */
      for (;;) {
        if (*cp == '\'') {
          dp->flags |= FLAG_GROUP;
          cp++;
        } else if (*cp == '-') {
          dp->flags |= FLAG_LEFT;
          cp++;
        } else if (*cp == '+') {
          dp->flags |= FLAG_SHOWSIGN;
          cp++;
        } else if (*cp == ' ') {
          dp->flags |= FLAG_SPACE;
          cp++;
        } else if (*cp == '#') {
          dp->flags |= FLAG_ALT;
          cp++;
        } else if (*cp == '0') {
          dp->flags |= FLAG_ZERO;
          cp++;
        } else
          break;
      }

      /* Parse the field width.  */
      if (*cp == '*') {
        dp->width_start = cp;
        cp++;
        dp->width_end = cp;
        if (max_width_length < 1)
          max_width_length = 1;

        /* Test for positional argument.  */
        if (*cp >= '0' && *cp <= '9') {
          const char *np;

          for (np = cp; *np >= '0' && *np <= '9'; np++);
          if (*np == '$') {
            unsigned int n = 0;

            for (np = cp; *np >= '0' && *np <= '9'; np++)
              n = 10 * n + (*np - '0');
            if (n == 0)
              /* Positional argument 0.  */
              goto error;
            dp->width_arg_index = n - 1;
            cp = np + 1;
          }
        }
        if (dp->width_arg_index < 0)
          dp->width_arg_index = arg_posn++;
        REGISTER_ARG (dp->width_arg_index, TYPE_INT);
      } else if (*cp >= '0' && *cp <= '9') {
        unsigned int width_length;

        dp->width_start = cp;
        for (; *cp >= '0' && *cp <= '9'; cp++);
        dp->width_end = cp;
        width_length = dp->width_end - dp->width_start;
        if (max_width_length < width_length)
          max_width_length = width_length;
      }

      /* Parse the precision.  */
      if (*cp == '.') {
        cp++;
        if (*cp == '*') {
          dp->precision_start = cp - 1;
          cp++;
          dp->precision_end = cp;
          if (max_precision_length < 2)
            max_precision_length = 2;

          /* Test for positional argument.  */
          if (*cp >= '0' && *cp <= '9') {
            const char *np;

            for (np = cp; *np >= '0' && *np <= '9'; np++);
            if (*np == '$') {
              unsigned int n = 0;

              for (np = cp; *np >= '0' && *np <= '9'; np++)
                n = 10 * n + (*np - '0');
              if (n == 0)
                /* Positional argument 0.  */
                goto error;
              dp->precision_arg_index = n - 1;
              cp = np + 1;
            }
          }
          if (dp->precision_arg_index < 0)
            dp->precision_arg_index = arg_posn++;
          REGISTER_ARG (dp->precision_arg_index, TYPE_INT);
        } else {
          unsigned int precision_length;

          dp->precision_start = cp - 1;
          for (; *cp >= '0' && *cp <= '9'; cp++);
          dp->precision_end = cp;
          precision_length = dp->precision_end - dp->precision_start;
          if (max_precision_length < precision_length)
            max_precision_length = precision_length;
        }
      }

      {
        arg_type type;

        /* Parse argument type/size specifiers.  */
        {
          int flags = 0;

          for (;;) {
            if (*cp == 'h') {
              flags |= (1 << (flags & 1));
              cp++;
            } else if (*cp == 'L') {
              flags |= 4;
              cp++;
            } else if (*cp == 'l') {
              flags += 8;
              cp++;
            }
#ifdef HAVE_INT64_AND_I64
            else if (cp[0] == 'I' && cp[1] == '6' && cp[2] == '4') {
              flags = 64;
              cp += 3;
            }
#endif
#ifdef HAVE_INTMAX_T
            else if (*cp == 'j') {
              if (sizeof (intmax_t) > sizeof (long)) {
                /* intmax_t = long long */
                flags += 16;
              } else if (sizeof (intmax_t) > sizeof (int)) {
                /* intmax_t = long */
                flags += 8;
              }
              cp++;
            }
#endif
            else if (*cp == 'z' || *cp == 'Z') {
              /* 'z' is standardized in ISO C 99, but glibc uses 'Z'
                 because the warning facility in gcc-2.95.2 understands
                 only 'Z' (see gcc-2.95.2/gcc/c-common.c:1784).  */
              if (sizeof (size_t) > sizeof (long)) {
                /* size_t = long long */
                flags += 16;
              } else if (sizeof (size_t) > sizeof (int)) {
                /* size_t = long */
                flags += 8;
              }
              cp++;
            } else if (*cp == 't') {
              if (sizeof (ptrdiff_t) > sizeof (long)) {
                /* ptrdiff_t = long long */
                flags += 16;
              } else if (sizeof (ptrdiff_t) > sizeof (int)) {
                /* ptrdiff_t = long */
                flags += 8;
              }
              cp++;
            } else
              break;
          }

          /* Read the conversion character.  */
          c = *cp++;
          switch (c) {
            case 'd':
            case 'i':
#ifdef HAVE_INT64_AND_I64
              if (flags == 64)
                type = TYPE_INT64;
              else
#endif
#ifdef HAVE_LONG_LONG
              if (flags >= 16 || (flags & 4))
                type = TYPE_LONGLONGINT;
              else
#endif
              if (flags >= 8)
                type = TYPE_LONGINT;
              else if (flags & 2)
                type = TYPE_SCHAR;
              else if (flags & 1)
                type = TYPE_SHORT;
              else
                type = TYPE_INT;
              break;
            case 'o':
            case 'u':
            case 'x':
            case 'X':
#ifdef HAVE_INT64_AND_I64
              if (flags == 64)
                type = TYPE_UINT64;
              else
#endif
#ifdef HAVE_LONG_LONG
              if (flags >= 16 || (flags & 4))
                type = TYPE_ULONGLONGINT;
              else
#endif
              if (flags >= 8)
                type = TYPE_ULONGINT;
              else if (flags & 2)
                type = TYPE_UCHAR;
              else if (flags & 1)
                type = TYPE_USHORT;
              else
                type = TYPE_UINT;
              break;
            case 'f':
            case 'F':
            case 'e':
            case 'E':
            case 'g':
            case 'G':
            case 'a':
            case 'A':
#ifdef HAVE_LONG_DOUBLE
              if (flags >= 16 || (flags & 4))
                type = TYPE_LONGDOUBLE;
              else
#endif
                type = TYPE_DOUBLE;
              break;
            case 'c':
              if (flags >= 8)
#ifdef HAVE_WINT_T
                type = TYPE_WIDE_CHAR;
#else
                goto error;
#endif
              else
                type = TYPE_CHAR;
              break;
#ifdef HAVE_WINT_T
            case 'C':
              type = TYPE_WIDE_CHAR;
              c = 'c';
              break;
#endif
            case 's':
              if (flags >= 8)
#ifdef HAVE_WCHAR_T
                type = TYPE_WIDE_STRING;
#else
                goto error;
#endif
              else
                type = TYPE_STRING;
              break;
#ifdef HAVE_WCHAR_T
            case 'S':
              type = TYPE_WIDE_STRING;
              c = 's';
              break;
#endif
              /* Old GST_PTR_FORMAT, handle for binary backwards compatibility */
            case 'P':
              type = TYPE_POINTER_EXT;
              dp->flags |= FLAG_PTR_EXT;
              dp->ptr_ext_char = 'A';
              c = 'p';
              break;
            case 'p':
              /* Note: cp points already to the char after the 'p' now */
              if (cp[0] == POINTER_EXT_SIGNIFIER_CHAR && cp[1] != '\0') {
                type = TYPE_POINTER_EXT;
                dp->flags |= FLAG_PTR_EXT;
                dp->ptr_ext_char = cp[1];
                cp += 2;
                /* we do not use dp->conversion='s' on purpose here, so we
                 * can fall back to printing just the pointer with %p if the
                 * serialisation function returned NULL for some reason */
              } else {
                type = TYPE_POINTER;
              }
              break;
              /* Old GST_SEGMENT_FORMAT, handle for backwards compatibility */
            case 'Q':
              type = TYPE_POINTER_EXT;
              dp->flags |= FLAG_PTR_EXT;
              dp->ptr_ext_char = 'B';
              c = 'p';
              break;
            case 'n':
#ifdef HAVE_LONG_LONG
              if (flags >= 16 || (flags & 4))
                type = TYPE_COUNT_LONGLONGINT_POINTER;
              else
#endif
              if (flags >= 8)
                type = TYPE_COUNT_LONGINT_POINTER;
              else if (flags & 2)
                type = TYPE_COUNT_SCHAR_POINTER;
              else if (flags & 1)
                type = TYPE_COUNT_SHORT_POINTER;
              else
                type = TYPE_COUNT_INT_POINTER;
              break;
            case '%':
              type = TYPE_NONE;
              break;
            default:
              /* Unknown conversion character.  */
              goto error;
          }
        }

        if (type != TYPE_NONE) {
          dp->arg_index = arg_index;
          if (dp->arg_index < 0)
            dp->arg_index = arg_posn++;
          REGISTER_ARG (dp->arg_index, type);
        }
        dp->conversion = c;
        dp->dir_end = cp;
      }

      d->count++;
      if (d->count >= d_allocated) {
        char_directive *memory;

        d_allocated = 2 * d_allocated;
        memory = realloc (d->dir, d_allocated * sizeof (char_directive));
        if (memory == NULL)
          /* Out of memory.  */
          goto error;
        d->dir = memory;
      }
    }
  }
  d->dir[d->count].dir_start = cp;

  d->max_width_length = max_width_length;
  d->max_precision_length = max_precision_length;
  return 0;

error:
  if (a->arg)
    free (a->arg);
  if (d->dir)
    free (d->dir);
  return -1;
}