Switch string pool code to an insertion sort - provides a modest 25% improvement

to open speeds on typical files.

CHANGES.md

@@ -2,6 +2,13 @@ Changes in PDFio
 ================
 
 
+v1.2.1 (Month DD, YYYY)
+-----------------------
+
+- Updated number support to avoid locale issues (Issue #61)
+- Optimized string pool code.
+
+
 v1.2.0 (January 24, 2024)
 -------------------------
 

Makefile.in

@@ -1,7 +1,7 @@
 #
 # Makefile for PDFio.
 #
-# Copyright © 2021-2023 by Michael R Sweet.
+# Copyright © 2021-2024 by Michael R Sweet.
 #
 # Licensed under Apache License v2.0.  See the file "LICENSE" for more
 # information.
@@ -163,7 +163,9 @@ install:	$(TARGETS)
 # Test everything
 test:	testpdfio testttf
 	./testttf 2>test.log
-	./testpdfio 2>test.log
+	./testpdfio 2>>test.log
+	LANG=fr_FR.UTF-8 ./testpdfio 2>>test.log
+
 
 valgrind:	testpdfio
 	valgrind --leak-check=full ./testpdfio

configure

@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.71 for pdfio 1.2.0.
+# Generated by GNU Autoconf 2.71 for pdfio 1.2.1.
 #
 # Report bugs to <https://github.com/michaelrsweet/pdfio/issues>.
 #
@@ -610,8 +610,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='pdfio'
 PACKAGE_TARNAME='pdfio'
-PACKAGE_VERSION='1.2.0'
-PACKAGE_STRING='pdfio 1.2.0'
+PACKAGE_VERSION='1.2.1'
+PACKAGE_STRING='pdfio 1.2.1'
 PACKAGE_BUGREPORT='https://github.com/michaelrsweet/pdfio/issues'
 PACKAGE_URL='https://www.msweet.org/pdfio'
 
@@ -1293,7 +1293,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures pdfio 1.2.0 to adapt to many kinds of systems.
+\`configure' configures pdfio 1.2.1 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1359,7 +1359,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of pdfio 1.2.0:";;
+     short | recursive ) echo "Configuration of pdfio 1.2.1:";;
    esac
   cat <<\_ACEOF
 
@@ -1456,7 +1456,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-pdfio configure 1.2.0
+pdfio configure 1.2.1
 generated by GNU Autoconf 2.71
 
 Copyright (C) 2021 Free Software Foundation, Inc.
@@ -1612,7 +1612,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by pdfio $as_me 1.2.0, which was
+It was created by pdfio $as_me 1.2.1, which was
 generated by GNU Autoconf 2.71.  Invocation command line was
 
   $ $0$ac_configure_args_raw
@@ -2368,9 +2368,9 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
-PDFIO_VERSION="1.2.0"
-PDFIO_VERSION_MAJOR="`echo 1.2.0 | awk -F. '{print $1}'`"
-PDFIO_VERSION_MINOR="`echo 1.2.0 | awk -F. '{printf("%d\n",$2);}'`"
+PDFIO_VERSION="1.2.1"
+PDFIO_VERSION_MAJOR="`echo 1.2.1 | awk -F. '{print $1}'`"
+PDFIO_VERSION_MINOR="`echo 1.2.1 | awk -F. '{printf("%d\n",$2);}'`"
 
 
 
@@ -4029,8 +4029,8 @@ then :
 
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 printf "%s\n" "yes" >&6; }
-    LIBS="$($PKGCONFIG --libs zlib) $LIBS"
     CPPFLAGS="$($PKGCONFIG --cflags zlib) $CPPFLAGS"
+    LIBS="$($PKGCONFIG --libs zlib) $LIBS"
 
 else $as_nop
 
@@ -4093,6 +4093,7 @@ then :
 
 fi
 
+    PKGCONFIG_REQUIRES=""
     PKGCONFIG_LIBS_PRIVATE="-lz $PKGCONFIG_LIBS_PRIVATE"
 
 fi
@@ -4934,7 +4935,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by pdfio $as_me 1.2.0, which was
+This file was extended by pdfio $as_me 1.2.1, which was
 generated by GNU Autoconf 2.71.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -4990,7 +4991,7 @@ ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-pdfio config.status 1.2.0
+pdfio config.status 1.2.1
 configured by $0, generated by GNU Autoconf 2.71,
   with options \\"\$ac_cs_config\\"
 

configure.ac

@@ -21,7 +21,7 @@ AC_PREREQ([2.70])
 
 
 dnl Package name and version...
-AC_INIT([pdfio], [1.2.0], [https://github.com/michaelrsweet/pdfio/issues], [pdfio], [https://www.msweet.org/pdfio])
+AC_INIT([pdfio], [1.2.1], [https://github.com/michaelrsweet/pdfio/issues], [pdfio], [https://www.msweet.org/pdfio])
 
 PDFIO_VERSION="AC_PACKAGE_VERSION"
 PDFIO_VERSION_MAJOR="`echo AC_PACKAGE_VERSION | awk -F. '{print $1}'`"

pdfio-common.c

@@ -1,7 +1,7 @@
 //
 // Common support functions for pdfio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2024 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
@@ -261,7 +261,7 @@ _pdfioFilePrintf(pdfio_file_t *pdf,	// I - PDF file
 
   // Format the string...
   va_start(ap, format);
-  vsnprintf(buffer, sizeof(buffer), format, ap);
+  _pdfio_vsnprintf(pdf, buffer, sizeof(buffer), format, ap);
   va_end(ap);
 
   // Write it...

pdfio-file.c

@@ -1,7 +1,7 @@
 //
 // PDF file functions for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2024 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
@@ -20,6 +20,7 @@
 static pdfio_obj_t	*add_obj(pdfio_file_t *pdf, size_t number, unsigned short generation, off_t offset);
 static int		compare_objmaps(_pdfio_objmap_t *a, _pdfio_objmap_t *b);
 static const char	*get_info_string(pdfio_file_t *pdf, const char *key);
+static struct lconv	*get_lconv(void);
 static bool		load_obj_stream(pdfio_obj_t *obj);
 static bool		load_pages(pdfio_file_t *pdf, pdfio_obj_t *obj, size_t depth);
 static bool		load_xref(pdfio_file_t *pdf, off_t xref_offset, pdfio_password_cb_t password_cb, void *password_data);
@@ -217,6 +218,7 @@ pdfioFileCreate(
     return (NULL);
   }
 
+  pdf->loc         = get_lconv();
   pdf->filename    = strdup(filename);
   pdf->version     = strdup(version);
   pdf->mode        = _PDFIO_MODE_WRITE;
@@ -259,9 +261,12 @@ pdfioFileCreate(
   }
 
   // Write a standard PDF header...
-  if (!_pdfioFilePrintf(pdf, "%%PDF-%s\n%%\342\343\317\323\n", version))
+  if (!_pdfioFilePrintf(pdf, "%%PDF-%s\n%%PDF\303\254o\n", version))
     goto error;
 
+  if (pdf->loc)
+    _pdfioFilePrintf(pdf, "%%decimal_point=\"%s\"\n", pdf->loc->decimal_point);
+
   // Create the pages object...
   if ((dict = pdfioDictCreate(pdf)) == NULL)
     goto error;
@@ -508,6 +513,7 @@ pdfioFileCreateOutput(
     return (NULL);
   }
 
+  pdf->loc         = get_lconv();
   pdf->filename    = strdup("output.pdf");
   pdf->version     = strdup(version);
   pdf->mode        = _PDFIO_MODE_WRITE;
@@ -787,6 +793,7 @@ pdfioFileCreateTemporary(
       break;
   }
 
+  pdf->loc      = get_lconv();
   pdf->filename = strdup(buffer);
 
   if (i >= 1000)
@@ -1218,6 +1225,7 @@ pdfioFileOpen(
     return (NULL);
   }
 
+  pdf->loc         = get_lconv();
   pdf->filename    = strdup(filename);
   pdf->mode        = _PDFIO_MODE_READ;
   pdf->error_cb    = error_cb;
@@ -1576,6 +1584,28 @@ get_info_string(pdfio_file_t *pdf,	// I - PDF file
 }
 
 
+//
+// 'get_lconv()' - Get any locale-specific numeric information.
+//
+
+static struct lconv *			// O - Locale information or `NULL`
+get_lconv(void)
+{
+  struct lconv	*loc;			// Locale information
+
+
+  if ((loc = localeconv()) != NULL)
+  {
+    PDFIO_DEBUG("get_lconv: loc=%p, loc->decimal_point=\"%s\"\n", loc, loc->decimal_point);
+
+    if (!loc->decimal_point || !strcmp(loc->decimal_point, "."))
+      loc = NULL;
+  }
+
+  return (loc);
+}
+
+
 //
 // 'load_obj_stream()' - Load an object stream.
 //

pdfio-private.h

@@ -1,7 +1,7 @@
 //
 // Private header file for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2024 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
@@ -20,6 +20,7 @@
 #  include <errno.h>
 #  include <inttypes.h>
 #  include <fcntl.h>
+#  include <locale.h>
 #  ifdef _WIN32
 #    include <io.h>
 #    include <direct.h>
@@ -224,6 +225,7 @@ typedef struct _pdfio_objmap_s		// PDF object map
 struct _pdfio_file_s			// PDF file structure
 {
   char		*filename;		// Filename
+  struct lconv	*loc;			// Locale data
   char		*version;		// Version number
   pdfio_rect_t	media_box,		// Default MediaBox value
 		crop_box;		// Default CropBox value
@@ -322,6 +324,9 @@ struct _pdfio_stream_s			// Stream
 // Functions...
 //
 
+extern double		_pdfio_strtod(pdfio_file_t *pdf, const char *s) _PDFIO_INTERNAL;
+extern ssize_t		_pdfio_vsnprintf(pdfio_file_t *pdf, char *buffer, size_t bufsize, const char *format, va_list ap) _PDFIO_INTERNAL;
+
 extern bool		_pdfioArrayDecrypt(pdfio_file_t *pdf, pdfio_obj_t *obj, pdfio_array_t *a, size_t depth) _PDFIO_INTERNAL;
 extern void		_pdfioArrayDebug(pdfio_array_t *a, FILE *fp) _PDFIO_INTERNAL;
 extern void		_pdfioArrayDelete(pdfio_array_t *a) _PDFIO_INTERNAL;

pdfio-stream.c

@@ -1,7 +1,7 @@
 //
 // PDF stream functions for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2024 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
@@ -687,7 +687,7 @@ pdfioStreamPrintf(
 
   // Format the string...
   va_start(ap, format);
-  vsnprintf(buffer, sizeof(buffer), format, ap);
+  _pdfio_vsnprintf(st->pdf, buffer, sizeof(buffer), format, ap);
   va_end(ap);
 
   // Write the string...

pdfio-string.c

@@ -1,7 +1,7 @@
 //
-// PDF dictionary functions for PDFio.
+// PDF string functions for PDFio.
 //
-// Copyright © 2021 by Michael R Sweet.
+// Copyright © 2021-2024 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
@@ -14,7 +14,360 @@
 // Local functions...
 //
 
-static int	compare_strings(char **a, char **b);
+static size_t	find_string(pdfio_file_t *pdf, const char *s, int *rdiff);
+
+
+//
+// '_pdfio_strtod()' - Convert a string to a double value.
+//
+// This function wraps strtod() to avoid locale issues.
+//
+
+double					// O - Double value
+_pdfio_strtod(pdfio_file_t *pdf,	// I - PDF file
+              const char   *s)		// I - String
+{
+  char	temp[64],			// Temporary buffer
+	*tempptr;			// Pointer into temporary buffer
+
+
+  // See if the locale has a special decimal point string...
+  if (!pdf->loc)
+    return (strtod(s, NULL));
+
+  // Copy leading sign, numbers, period, and then numbers...
+  tempptr                = temp;
+  temp[sizeof(temp) - 1] = '\0';
+
+  while (*s && *s != '.')
+  {
+    if (tempptr < (temp + sizeof(temp) - 1))
+      *tempptr++ = *s++;
+    else
+      return (0.0);
+  }
+
+  if (*s == '.')
+  {
+    // Convert decimal point to locale equivalent...
+    size_t	declen = strlen(pdf->loc->decimal_point);
+					// Length of decimal point
+    s ++;
+
+    if (declen <= (sizeof(temp) - (size_t)(tempptr - temp)))
+    {
+      memcpy(tempptr, pdf->loc->decimal_point, declen);
+      tempptr += declen;
+    }
+    else
+    {
+      return (0.0);
+    }
+  }
+
+  // Copy any remaining characters...
+  while (*s)
+  {
+    if (tempptr < (temp + sizeof(temp) - 1))
+      *tempptr++ = *s++;
+    else
+      return (0.0);
+  }
+
+  // Nul-terminate the temporary string and convert the string...
+  *tempptr = '\0';
+
+  return (strtod(temp, NULL));
+}
+
+
+//
+// '_pdfio_vsnprintf()' - Format a string.
+//
+// This function emulates vsnprintf() to avoid locale issues.
+//
+
+ssize_t					// O - Number of bytes
+_pdfio_vsnprintf(pdfio_file_t *pdf,	// I - PDF file
+                 char         *buffer,	// I - Output buffer
+                 size_t       bufsize,	// I - Size of output buffer
+                 const char   *format,	// I - printf-style format string
+                 va_list      ap)	// I - Pointer to additional arguments
+{
+  char		*bufptr,		// Pointer to position in buffer
+		*bufend,		// Pointer to end of buffer
+		size,			// Size character (h, l, L)
+		type;			// Format type character
+  int		width,			// Width of field
+		prec;			// Number of characters of precision
+  char		tformat[100],		// Temporary format string for snprintf()
+		*tptr,			// Pointer into temporary format
+		temp[1024],		// Buffer for formatted numbers
+		*tempptr;		// Pointer into buffer
+  char		*s;			// Pointer to string
+  ssize_t	bytes;			// Total number of bytes needed
+  const char	*dec = pdf->loc ? pdf->loc->decimal_point : ".";
+					// Decimal point string
+  char		*decptr;		// Pointer to decimal point
+
+
+  // Loop through the format string, formatting as needed...
+  bufptr  = buffer;
+  bufend  = buffer + bufsize - 1;
+  *bufend = '\0';
+  bytes   = 0;
+
+  while (*format)
+  {
+    if (*format == '%')
+    {
+      // Format character...
+      tptr = tformat;
+      *tptr++ = *format++;
+
+      if (*format == '%')
+      {
+        if (bufptr < bufend)
+	  *bufptr++ = *format;
+        bytes ++;
+        format ++;
+	continue;
+      }
+      else if (strchr(" -+#\'", *format))
+      {
+        *tptr++ = *format++;
+      }
+
+      if (*format == '*')
+      {
+        // Get width from argument...
+	format ++;
+	width = va_arg(ap, int);
+
+	snprintf(tptr, sizeof(tformat) - (size_t)(tptr - tformat), "%d", width);
+	tptr += strlen(tptr);
+      }
+      else
+      {
+	width = 0;
+
+	while (isdigit(*format & 255))
+	{
+	  if (tptr < (tformat + sizeof(tformat) - 1))
+	    *tptr++ = *format;
+
+	  width = width * 10 + *format++ - '0';
+	}
+      }
+
+      if (*format == '.')
+      {
+	if (tptr < (tformat + sizeof(tformat) - 1))
+	  *tptr++ = *format;
+
+        format ++;
+
+        if (*format == '*')
+	{
+          // Get precision from argument...
+	  format ++;
+	  prec = va_arg(ap, int);
+
+	  snprintf(tptr, sizeof(tformat) - (size_t)(tptr - tformat), "%d", prec);
+	  tptr += strlen(tptr);
+	}
+	else
+	{
+	  prec = 0;
+
+	  while (isdigit(*format & 255))
+	  {
+	    if (tptr < (tformat + sizeof(tformat) - 1))
+	      *tptr++ = *format;
+
+	    prec = prec * 10 + *format++ - '0';
+	  }
+	}
+      }
+
+      if (*format == 'l' && format[1] == 'l')
+      {
+        size = 'L';
+
+	if (tptr < (tformat + sizeof(tformat) - 2))
+	{
+	  *tptr++ = 'l';
+	  *tptr++ = 'l';
+	}
+
+	format += 2;
+      }
+      else if (*format == 'h' || *format == 'l' || *format == 'L')
+      {
+	if (tptr < (tformat + sizeof(tformat) - 1))
+	  *tptr++ = *format;
+
+        size = *format++;
+      }
+      else
+      {
+        size = 0;
+      }
+
+      if (!*format)
+        break;
+
+      if (tptr < (tformat + sizeof(tformat) - 1))
+        *tptr++ = *format;
+
+      type  = *format++;
+      *tptr = '\0';
+
+      switch (type)
+      {
+	case 'E' : // Floating point formats
+	case 'G' :
+	case 'e' :
+	case 'f' :
+	case 'g' :
+	    if ((size_t)(width + 2) > sizeof(temp))
+	      break;
+
+	    snprintf(temp, sizeof(temp), tformat, va_arg(ap, double));
+
+	    if ((decptr = strstr(temp, dec)) != NULL)
+	    {
+	      // Convert locale decimal point to "."
+	      PDFIO_DEBUG("_pdfio_vsnprintf: Before \"%s\"\n", temp);
+	      tempptr = decptr + strlen(dec);
+	      if (tempptr > (decptr + 1))
+	        memmove(decptr + 1, tempptr, strlen(tempptr) + 1);
+	      *decptr = '.';
+
+	      // Strip trailing 0's...
+	      for (tempptr = temp + strlen(temp) - 1; tempptr > temp && *tempptr == '0'; tempptr --)
+		*tempptr = '\0';
+
+	      if (*tempptr == '.')
+		*tempptr = '\0';	// Strip trailing decimal point
+
+	      PDFIO_DEBUG("_pdfio_vsnprintf: After \"%s\"\n", temp);
+	    }
+
+            // Copy to the output buffer
+            bytes += (int)strlen(temp);
+
+            if (bufptr < bufend)
+	    {
+	      strncpy(bufptr, temp, (size_t)(bufend - bufptr - 1));
+	      bufptr += strlen(bufptr);
+	    }
+	    break;
+
+        case 'B' : // Integer formats
+	case 'X' :
+	case 'b' :
+        case 'd' :
+	case 'i' :
+	case 'o' :
+	case 'u' :
+	case 'x' :
+	    if ((size_t)(width + 2) > sizeof(temp))
+	      break;
+
+#  ifdef HAVE_LONG_LONG
+            if (size == 'L')
+	      snprintf(temp, sizeof(temp), tformat, va_arg(ap, long long));
+	    else
+#  endif // HAVE_LONG_LONG
+            if (size == 'l')
+	      snprintf(temp, sizeof(temp), tformat, va_arg(ap, long));
+	    else
+	      snprintf(temp, sizeof(temp), tformat, va_arg(ap, int));
+
+            bytes += (int)strlen(temp);
+
+	    if (bufptr < bufend)
+	    {
+	      strncpy(bufptr, temp, (size_t)(bufend - bufptr - 1));
+	      bufptr += strlen(bufptr);
+	    }
+	    break;
+
+	case 'p' : // Pointer value
+	    if ((size_t)(width + 2) > sizeof(temp))
+	      break;
+
+	    snprintf(temp, sizeof(temp), tformat, va_arg(ap, void *));
+
+            bytes += (int)strlen(temp);
+
+	    if (bufptr < bufend)
+	    {
+	      strncpy(bufptr, temp, (size_t)(bufend - bufptr - 1));
+	      bufptr += strlen(bufptr);
+	    }
+	    break;
+
+        case 'c' : // Character or character array
+	    bytes += width;
+
+	    if (bufptr < bufend)
+	    {
+	      if (width <= 1)
+	      {
+	        *bufptr++ = (char)va_arg(ap, int);
+	      }
+	      else
+	      {
+		if ((bufptr + width) > bufend)
+		  width = (int)(bufend - bufptr);
+
+		memcpy(bufptr, va_arg(ap, char *), (size_t)width);
+		bufptr += width;
+	      }
+	    }
+	    break;
+
+	case 's' : // String
+	    if ((s = va_arg(ap, char *)) == NULL)
+	      s = "(null)";
+
+            bytes += strlen(s);
+
+	    if (bufptr < bufend)
+	    {
+	      strncpy(bufptr, s, (size_t)(bufend - bufptr - 1));
+	      bufptr += strlen(bufptr);
+	    }
+	    break;
+
+	case 'n' : // Output number of chars so far
+	    *(va_arg(ap, int *)) = (int)bytes;
+	    break;
+      }
+    }
+    else
+    {
+      // Literal character...
+      bytes ++;
+
+      if (bufptr < bufend)
+        *bufptr++ = *format++;
+    }
+  }
+
+  // Nul-terminate the string and return the number of characters needed.
+  if (bufptr < bufend)
+  {
+    // Everything fit in the buffer...
+    *bufptr = '\0';
+  }
+
+  PDFIO_DEBUG("_pdfio_vsnprintf: Returning %ld \"%s\"\n", (long)bytes, buffer);
+
+  return (bytes);
+}
 
 
 //
@@ -32,8 +385,9 @@ pdfioStringCreate(
     pdfio_file_t *pdf,			// I - PDF file
     const char   *s)			// I - Nul-terminated string
 {
-  char	*news;				// New string
-  char	**match;			// Matching string
+  char		*news;			// New string
+  size_t	idx;			// Index into strings
+  int		diff;			// Different
 
 
   PDFIO_DEBUG("pdfioStringCreate(pdf=%p, s=\"%s\")\n", pdf, s);
@@ -43,8 +397,17 @@ pdfioStringCreate(
     return (NULL);
 
   // See if the string has already been added...
-  if (pdf->num_strings > 0 && (match = (char **)bsearch(&s, pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings)) != NULL)
-    return (*match);
+  if (pdf->num_strings > 0)
+  {
+    idx = find_string(pdf, s, &diff);
+    if (diff == 0)
+      return (pdf->strings[idx]);
+  }
+  else
+  {
+    idx  = 0;
+    diff = -1;
+  }
 
   // Not already added, so add it...
   if ((news = strdup(s)) == NULL)
@@ -65,11 +428,17 @@ pdfioStringCreate(
     pdf->alloc_strings += 128;
   }
 
-  // TODO: Change to insertion sort as needed...
-  pdf->strings[pdf->num_strings ++] = news;
+  // Insert the string...
+  if (diff > 0)
+    idx ++;
 
-  if (pdf->num_strings > 1)
-    qsort(pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings);
+  PDFIO_DEBUG("pdfioStringCreate: Inserting \"%s\" at %u\n", news, (unsigned)idx);
+
+  if (idx < pdf->num_strings)
+    memmove(pdf->strings + idx + 1, pdf->strings + idx, (pdf->num_strings - idx) * sizeof(char *));
+
+  pdf->strings[idx] = news;
+  pdf->num_strings ++;
 
   PDFIO_DEBUG("pdfioStringCreate: %lu strings\n", (unsigned long)pdf->num_strings);
 
@@ -120,17 +489,67 @@ _pdfioStringIsAllocated(
     pdfio_file_t *pdf,			// I - PDF file
     const char   *s)			// I - String
 {
-  return (pdf->num_strings > 0 && bsearch(&s, pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings) != NULL);
+  int	diff;				// Difference
+
+
+  if (pdf->num_strings == 0)
+    return (false);
+
+  find_string(pdf, s, &diff);
+
+  return (diff == 0);
 }
 
 
 //
-// 'compare_strings()' - Compare two strings.
+// 'find_string()' - Find an element in the array.
 //
 
-static int				// O - Result of comparison
-compare_strings(char **a,		// I - First string
-                char **b)		// I - Second string
+static size_t				// O - Index of match
+find_string(pdfio_file_t *pdf,		// I - PDF file
+	    const char   *s,		// I - String to find
+	    int          *rdiff)	// O - Difference of match
 {
-  return (strcmp(*a, *b));
+  size_t	left,			// Left side of search
+		right,			// Right side of search
+		current;		// Current element
+  int		diff;			// Comparison with current element
+
+
+  // Do a binary search for the string...
+  left  = 0;
+  right = pdf->num_strings - 1;
+
+  do
+  {
+    current = (left + right) / 2;
+    diff    = strcmp(s, pdf->strings[current]);
+
+    if (diff == 0)
+      break;
+    else if (diff < 0)
+      right = current;
+    else
+      left = current;
+  }
+  while ((right - left) > 1);
+
+  if (diff != 0)
+  {
+    // Check the last 1 or 2 elements...
+    if ((diff = strcmp(s, pdf->strings[left])) <= 0)
+    {
+      current = left;
+    }
+    else
+    {
+      diff    = strcmp(s, pdf->strings[right]);
+      current = right;
+    }
+  }
+
+  // Return the closest string and the difference...
+  *rdiff = diff;
+
+  return (current);
 }

pdfio-value.c

@@ -1,7 +1,7 @@
 //
 // PDF value functions for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2024 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
@@ -497,7 +497,7 @@ _pdfioValueRead(pdfio_file_t   *pdf,	// I - PDF file
 
     // If we get here, we have a number...
     v->type         = PDFIO_VALTYPE_NUMBER;
-    v->value.number = (double)strtod(token, NULL);
+    v->value.number = _pdfio_strtod(pdf, token);
   }
   else if (!strcmp(token, "true") || !strcmp(token, "false"))
   {

pdfio.h

@@ -1,7 +1,7 @@
 //
 // Public header file for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2024 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
@@ -23,7 +23,7 @@ extern "C" {
 // Version number...
 //
 
-#  define PDFIO_VERSION		"1.2.0"
+#  define PDFIO_VERSION		"1.2.1"
 
 
 //

testpdfio.c

@@ -1,7 +1,7 @@
 //
 // Test program for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2024 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
@@ -16,6 +16,7 @@
 #include "pdfio-private.h"
 #include "pdfio-content.h"
 #include <math.h>
+#include <locale.h>
 #ifndef M_PI
 #  define M_PI	3.14159265358979323846264338327950288
 #endif // M_PI
@@ -61,6 +62,8 @@ main(int  argc,				// I - Number of command-line arguments
   int	ret = 0;			// Return value
 
 
+  fprintf(stderr, "testpdfio: Test locale is \"%s\".\n", setlocale(LC_ALL, getenv("LANG")));
+
   if (argc > 1)
   {
     int		i;			// Looping var