Generate Sources of origin/master updated at Thu Jan 7 17:44:33 GMT 2016

src/glew.c

@@ -42,7 +42,7 @@
 #endif
 
 #include <stddef.h>  /* For size_t */
-#include <stdlib.h>  /* For malloc, free */
+#include <stdlib.h>  /* For bsearch */
 #include <string.h>  /* For memset */
 
 #if defined(GLEW_REGAL)
@@ -198,25 +198,19 @@ static GLuint _glewStrCLen (const GLubyte* s, GLubyte c)
   GLuint i=0;
   if (s == NULL) return 0;
   while (s[i] != '\0' && s[i] != c) i++;
-  return (s[i] == '\0' || s[i] == c) ? i : 0;
+  return i;
 }
 
-static GLubyte *_glewStrDup (const GLubyte *s)
+static GLuint _glewStrCopy(char *d, const char *s, char c)
 {
-    int n = _glewStrLen(s);
-    GLubyte *dup = malloc(n+1);
-    if (dup)
-    {
-        GLubyte *i = dup;
-        for (;;)
-        {
-            *i = *s;
-            if (*i) { ++i; ++s; } else break;
-        }
-    }
-    return dup;
+  GLuint i=0;
+  if (s == NULL) return 0;
+  while (s[i] != '\0' && s[i] != c) { d[i] = s[i]; i++; }
+  d[i] = '\0';
+  return i;
 }
 
+#if !defined(GLEW_OSMESA)
 #if !defined(__APPLE__) || defined(GLEW_APPLE_GLX)
 static GLboolean _glewStrSame (const GLubyte* a, const GLubyte* b, GLuint n)
 {
@@ -227,6 +221,7 @@ static GLboolean _glewStrSame (const GLubyte* a, const GLubyte* b, GLuint n)
   return i == n ? GL_TRUE : GL_FALSE;
 }
 #endif
+#endif
 
 static GLboolean _glewStrSame1 (const GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
 {
@@ -287,6 +282,7 @@ static GLboolean _glewStrSame3 (const GLubyte** a, GLuint* na, const GLubyte* b,
  * other extension names. Could use strtok() but the constant
  * string returned by glGetString might be in read-only memory.
  */
+#if !defined(GLEW_OSMESA)
 #if !defined(__APPLE__) || defined(GLEW_APPLE_GLX)
 static GLboolean _glewSearchExtension (const char* name, const GLubyte *start, const GLubyte *end)
 {
@@ -302,6 +298,7 @@ static GLboolean _glewSearchExtension (const char* name, const GLubyte *start, c
   return GL_FALSE;
 }
 #endif
+#endif
 
 #if !defined(_WIN32) || !defined(GLEW_MX)
 
@@ -16706,13 +16703,25 @@ static GLboolean _glewInit_GL_WIN_swap_hint ()
 
 static int _glewExtensionCompare(const void *a, const void *b)
 {
-   return strcmp((const char *) a, *(const char * const *) b);
+  /* http://www.chanduthedev.com/2012/07/strcmp-implementation-in-c.html */
+  const char *s1 = (const char *) a;
+  const char *s2 = *(const char * const *) b;
+  while (*s1 || *s2)
+  {
+      if (*s1 > *s2)
+          return 1;
+      if (*s1 < *s2)
+          return -1;
+      s1++;
+      s2++;
+  }
+  return 0;
 }
 
 static GLboolean *_glewGetExtensionString(const char *name)
 {
   const char **n = (const char **) bsearch(name, _glewExtensionLookup, sizeof(_glewExtensionLookup)/sizeof(char *)-1, sizeof(char *), _glewExtensionCompare);
-  int i;
+  ptrdiff_t i;
 
   if (n)
   {
@@ -16726,7 +16735,7 @@ static GLboolean *_glewGetExtensionString(const char *name)
 static GLboolean *_glewGetExtensionEnable(const char *name)
 {
   const char **n = (const char **) bsearch(name, _glewExtensionLookup, sizeof(_glewExtensionLookup)/sizeof(char *)-1, sizeof(char *), _glewExtensionCompare);
-  int i;
+  ptrdiff_t i;
 
   if (n)
   {
@@ -16737,17 +16746,17 @@ static GLboolean *_glewGetExtensionEnable(const char *name)
   return NULL;
 }
 
-static char *_glewNextSpace(char *i)
+static const char *_glewNextSpace(const char *i)
 {
-  char *j = i;
+  const char *j = i;
   if (j)
     while (*j!=' ' && *j) ++j;
   return j;
 }
 
-static char *_glewNextNonSpace(char *i)
+static const char *_glewNextNonSpace(const char *i)
 {
-  char *j = i;
+  const char *j = i;
   if (j)
     while (*j==' ') ++j;
   return j;
@@ -16841,36 +16850,38 @@ static GLenum GLEWAPIENTRY glewContextInit ()
   }
   else
   {
-    const GLubyte *ext;
-    char *begin;
-    char *end;
-    char *i;
-    char *j;
+    const char *extensions;
+    const char *end;
+    const char *i;
+    const char *j;
+    char ext[128];
     GLboolean *enable;
 
-    ext = glGetString(GL_EXTENSIONS);
+    extensions = (const char *) glGetString(GL_EXTENSIONS);
 
-    if (ext)
+    if (extensions)
     {
-      begin = (char *) _glewStrDup(ext);
-      end = begin + _glewStrLen((GLubyte *) begin);
-      for (i=begin; i<end; i = j + 1)
+      end = extensions + _glewStrLen((const GLubyte *) extensions);
+      for (i=extensions; i<end; i = j + 1)
       {
         i = _glewNextNonSpace(i);
         j = _glewNextSpace(i);
-        *j = 0;
+
+        /* Copy extension into NUL terminated string */
+        if (j-i >= (ptrdiff_t) sizeof(ext))
+          continue;
+        _glewStrCopy(ext, i, ' ');
 
         /* Based on extension string(s), glewGetExtension purposes */
-        enable = _glewGetExtensionString(i);
+        enable = _glewGetExtensionString(ext);
         if (enable)
           *enable = GL_TRUE;
 
         /* Based on extension string(s), experimental mode, glewIsSupported purposes */
-        enable = _glewGetExtensionEnable(i);
+        enable = _glewGetExtensionEnable(ext);
         if (enable)
           *enable = GL_TRUE;
       }
-      free(begin);
     }
   }
 #ifdef GL_VERSION_1_2