Avoid typecasting a signed char to an int when using is*() functions, as that

could very well cause a negate number get passed in and thus cause reading
outside of the array usually used for this purpose.

We avoid this by using the uppercase macro versions introduced just now that
does some extra crazy typecasts to avoid byte codes > 127 to cause negative
int values.

1 files changed, 20 insertions, 18 deletions

diff --git a/src/main.c b/src/main.c
index af3f4355f..24eec6b34 100644
--- a/src/main.c
+++ b/src/main.c
@@ -380,7 +380,7 @@ static void warnf(struct Configurable *config, const char *fmt, ...)
       if(len > (int)WARN_TEXTWIDTH) {
         int cut = WARN_TEXTWIDTH-1;
 
-        while(!isspace((int)ptr[cut]) && cut) {
+        while(!ISSPACE(ptr[cut]) && cut) {
           cut--;
         }
 
@@ -933,7 +933,7 @@ static int formparse(struct Configurable *config,
           while(ptr && (FORM_FILE_SEPARATOR!= *ptr)) {
 
             /* pass all white spaces */
-            while(isspace((int)*ptr))
+            while(ISSPACE(*ptr))
               ptr++;
 
             if(curlx_strnequal("type=", ptr, 5)) {
@@ -1155,7 +1155,7 @@ static void cleanarg(char *str)
 static int str2num(long *val, char *str)
 {
   int retcode = 0;
-  if(isdigit((int)*str))
+  if(ISDIGIT(*str))
     *val = atoi(str);
   else
     retcode = 1; /* badness */
@@ -1961,7 +1961,7 @@ static ParameterError getparameter(char *flag, /* f or -long-flag */
           if(ptr &&
              (ptr == &nextarg[1]) &&
              (nextarg[2] == '\\' || nextarg[2] == '/') &&
-             (isalpha((int)nextarg[0])) )
+             (ISALPHA(nextarg[0])) )
              /* colon in the second column, followed by a backslash, and the
                 first character is an alphabetic letter:
 
@@ -2463,7 +2463,7 @@ static int parseconfig(const char *filename,
     int lineno=0;
     bool alloced_param;
 
-#define isseparator(x) (((x)=='=') || ((x) == ':'))
+#define ISSEP(x) (((x)=='=') || ((x) == ':'))
 
     while (NULL != (aline = my_get_line(file))) {
       lineno++;
@@ -2471,7 +2471,7 @@ static int parseconfig(const char *filename,
       alloced_param=FALSE;
 
       /* lines with # in the fist column is a comment! */
-      while(*line && isspace((int)*line))
+      while(*line && ISSPACE(*line))
         line++;
 
       switch(*line) {
@@ -2487,7 +2487,7 @@ static int parseconfig(const char *filename,
 
       /* the option keywords starts here */
       option = line;
-      while(*line && !isspace((int)*line) && !isseparator(*line))
+      while(*line && !ISSPACE(*line) && !ISSEP(*line))
         line++;
       /* ... and has ended here */
 
@@ -2499,7 +2499,7 @@ static int parseconfig(const char *filename,
 #endif
 
       /* pass spaces and separator(s) */
-      while(*line && (isspace((int)*line) || isseparator(*line)))
+      while(*line && (ISSPACE(*line) || ISSEP(*line)))
         line++;
 
       /* the parameter starts here (unless quoted) */
@@ -2544,7 +2544,7 @@ static int parseconfig(const char *filename,
       }
       else {
         param=line; /* parameter starts here */
-        while(*line && !isspace((int)*line))
+        while(*line && !ISSPACE(*line))
           line++;
         *line=0; /* zero terminate */
       }
@@ -2852,7 +2852,8 @@ convert_from_network(char *buffer, size_t length)
 }
 
 static
-char convert_char(curl_infotype infotype, char this_char) {
+char convert_char(curl_infotype infotype, char this_char)
+{
 /* determine how this specific character should be displayed */
   switch(infotype) {
   case CURLINFO_DATA_IN:
@@ -2863,24 +2864,25 @@ char convert_char(curl_infotype infotype, char this_char) {
     if ((this_char >= 0x20) && (this_char < 0x7f)) {
       /* printable ASCII hex value: convert to host encoding */
       convert_from_network(&this_char, 1);
-    } else {
+    }
+    else {
       /* non-printable ASCII, use a replacement character */
-      return(UNPRINTABLE_CHAR);
+      return UNPRINTABLE_CHAR;
     }
     /* fall through to default */
   default:
     /* treat as host encoding */
-    if (isprint(this_char)
-    &&  (this_char != '\t')
-    &&  (this_char != '\r')
-    &&  (this_char != '\n')) {
+    if (ISPRINT(this_char)
+        &&  (this_char != '\t')
+        &&  (this_char != '\r')
+        &&  (this_char != '\n')) {
       /* printable characters excluding tabs and line end characters */
-      return(this_char);
+      return this_char;
     }
     break;
   }
   /* non-printable, use a replacement character  */
-  return(UNPRINTABLE_CHAR);
+  return UNPRINTABLE_CHAR;
 }
 #endif /* CURL_DOES_CONVERSIONS */