Eliminate less-than-zero checks for unsigned variables

* ext/bigdecimal/bigdecimal.c, ext/digest/md5/md5.c,
  ext/json/fbuffer/fbuffer.h, ext/json/generator/generator.c:
  Eliminate less-than-zero checks for unsigned variables.
  According to section 4.1.5 of C89 standard, size_t is an unsigned
  type.  These checks were found with 'cppcheck' static analysis tool.
  [ruby-core:57117] [Feature #8890]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42920 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

5 files changed, 16 insertions, 7 deletions

diff --git a/ChangeLog b/ChangeLog
index 006a58ce25..e3ffa28c54 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+Thu Sep 12 22:37:08 2013  Anton Ovchinnikov  <revolver112@gmail.com>
+
+	* ext/bigdecimal/bigdecimal.c, ext/digest/md5/md5.c,
+	  ext/json/fbuffer/fbuffer.h, ext/json/generator/generator.c:
+	  Eliminate less-than-zero checks for unsigned variables.
+	  According to section 4.1.5 of C89 standard, size_t is an unsigned
+	  type.  These checks were found with 'cppcheck' static analysis tool.
+	  [ruby-core:57117] [Feature #8890]
+
 Thu Sep 12 21:35:46 2013  Naohisa Goto  <ngotogenome@gmail.com>
 
 	* Makefile.in (libruby-static.a): change LDFLAGS order. LDFLAGS may
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index d1932e7213..f00ae45c74 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -3936,7 +3936,7 @@ VpAlloc(size_t mx, const char *szVal)
     }
     nalloc = (ni + nf + BASE_FIG - 1) / BASE_FIG + 1;    /* set effective allocation  */
     /* units for szVal[]  */
-    if (mx <= 0) mx = 1;
+    if (mx == 0) mx = 1;
     nalloc = Max(nalloc, mx);
     mx = nalloc;
     vp = VpAllocReal(mx);
@@ -5029,7 +5029,7 @@ VpFormatSt(char *psz, size_t fFmt)
     size_t ie, i, nf = 0;
     char ch;
 
-    if (fFmt <= 0) return;
+    if (fFmt == 0) return;
 
     ie = strlen(psz);
     for (i = 0; i < ie; ++i) {
@@ -6162,12 +6162,12 @@ VpVarCheck(Real * v)
 {
     size_t i;
 
-    if (v->MaxPrec <= 0) {
+    if (v->MaxPrec == 0) {
 	printf("ERROR(VpVarCheck): Illegal Max. Precision(=%"PRIuSIZE")\n",
 	       v->MaxPrec);
 	return 1;
     }
-    if (v->Prec <= 0 || v->Prec > v->MaxPrec) {
+    if (v->Prec == 0 || v->Prec > v->MaxPrec) {
 	printf("ERROR(VpVarCheck): Illegal Precision(=%"PRIuSIZE")\n", v->Prec);
 	printf("       Max. Prec.=%"PRIuSIZE"\n", v->MaxPrec);
 	return 2;
diff --git a/ext/digest/md5/md5.c b/ext/digest/md5/md5.c
index 518f8239ed..8d7d33c5a6 100644
--- a/ext/digest/md5/md5.c
+++ b/ext/digest/md5/md5.c
@@ -368,7 +368,7 @@ MD5_Update(MD5_CTX *pms, const uint8_t *data, size_t nbytes)
     size_t offset = (pms->count[0] >> 3) & 63;
     uint32_t nbits = (uint32_t)(nbytes << 3);
 
-    if (nbytes <= 0)
+    if (nbytes == 0)
 	return;
 
     /* Update the message length. */
diff --git a/ext/json/fbuffer/fbuffer.h b/ext/json/fbuffer/fbuffer.h
index 24bb088521..952ab30fa6 100644
--- a/ext/json/fbuffer/fbuffer.h
+++ b/ext/json/fbuffer/fbuffer.h
@@ -67,7 +67,7 @@ static VALUE fbuffer_to_s(FBuffer *fb);
 static FBuffer *fbuffer_alloc(unsigned long initial_length)
 {
     FBuffer *fb;
-    if (initial_length <= 0) initial_length = FBUFFER_INITIAL_LENGTH_DEFAULT;
+    if (initial_length == 0) initial_length = FBUFFER_INITIAL_LENGTH_DEFAULT;
     fb = ALLOC(FBuffer);
     memset((void *) fb, 0, sizeof(FBuffer));
     fb->initial_length = initial_length;
diff --git a/ext/json/generator/generator.c b/ext/json/generator/generator.c
index 7bc193455d..40c9e1e6df 100644
--- a/ext/json/generator/generator.c
+++ b/ext/json/generator/generator.c
@@ -288,7 +288,7 @@ static void convert_UTF8_to_JSON(FBuffer *buffer, VALUE string)
 
 static char *fstrndup(const char *ptr, unsigned long len) {
   char *result;
-  if (len <= 0) return NULL;
+  if (len == 0) return NULL;
   result = ALLOC_N(char, len);
   memccpy(result, ptr, 0, len);
   return result;