revert to correct C99 behaviour

Cset exclude: bcrl@redhat.com|ChangeSet|20020429021546|12619

lib/vsprintf.c

@@ -172,41 +172,50 @@ static char * number(char * buf, char * end, long long num, int base, int size,
 	if (!(type&(ZEROPAD+LEFT))) {
 		while(size-->0) {
 			if (buf <= end)
-				*buf++ = ' ';
+				*buf = ' ';
+			++buf;
 		}
 	}
 	if (sign) {
 		if (buf <= end)
-			*buf++ = sign;
+			*buf = sign;
+		++buf;
 	}
 	if (type & SPECIAL) {
 		if (base==8) {
 			if (buf <= end)
-				*buf++ = '0';
+				*buf = '0';
+			++buf;
 		} else if (base==16) {
 			if (buf <= end)
-				*buf++ = '0';
+				*buf = '0';
+			++buf;
 			if (buf <= end)
-				*buf++ = digits[33];
+				*buf = digits[33];
+			++buf;
 		}
 	}
 	if (!(type & LEFT)) {
 		while (size-- > 0) {
 			if (buf <= end)
-				*buf++ = c;
+				*buf = c;
+			++buf;
 		}
 	}
 	while (i < precision--) {
 		if (buf <= end)
-			*buf++ = '0';
+			*buf = '0';
+		++buf;
 	}
 	while (i-- > 0) {
 		if (buf <= end)
-			*buf++ = tmp[i];
+			*buf = tmp[i];
+		++buf;
 	}
 	while (size-- > 0) {
 		if (buf <= end)
-			*buf++ = ' ';
+			*buf = ' ';
+		++buf;
 	}
 	return buf;
 }
@@ -238,10 +247,6 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 				/* 'z' support added 23/7/1999 S.H.    */
 				/* 'z' changed to 'Z' --davidm 1/25/99 */
 
-	/* Enforce absolute minimum size: one character + the trailing 0 */
-	if (size < 2)
-		return 0;
-
 	str = buf;
 	end = buf + size - 1;
 
@@ -253,7 +258,8 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 	for (; *fmt ; ++fmt) {
 		if (*fmt != '%') {
 			if (str <= end)
-				*str++ = *fmt;
+				*str = *fmt;
+			++str;
 			continue;
 		}
 
@@ -317,15 +323,18 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 				if (!(flags & LEFT)) {
 					while (--field_width > 0) {
 						if (str <= end)
-							*str++ = ' ';
+							*str = ' ';
+						++str;
 					}
 				}
 				c = (unsigned char) va_arg(args, int);
 				if (str <= end)
-					*str++ = c;
+					*str = c;
+				++str;
 				while (--field_width > 0) {
 					if (str <= end)
-						*str++ = ' ';
+						*str = ' ';
+					++str;
 				}
 				continue;
 
@@ -339,16 +348,19 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 				if (!(flags & LEFT)) {
 					while (len < field_width--) {
 						if (str <= end)
-							*str++ = ' ';
+							*str = ' ';
+						++str;
 					}
 				}
 				for (i = 0; i < len; ++i) {
 					if (str <= end)
-						*str++ = *s++;
+						*str = *s;
+					++str; ++s;
 				}
 				while (len < field_width--) {
 					if (str <= end)
-						*str++ = ' ';
+						*str = ' ';
+					++str;
 				}
 				continue;
 
@@ -380,7 +392,8 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 
 			case '%':
 				if (str <= end)
-					*str++ = '%';
+					*str = '%';
+				++str;
 				continue;
 
 				/* integer number formats - set up the flags and "break" */
@@ -402,10 +415,12 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 
 			default:
 				if (str <= end)
-					*str++ = '%';
+					*str = '%';
+				++str;
 				if (*fmt) {
 					if (str <= end)
-						*str++ = *fmt;
+						*str = *fmt;
+					++str;
 				} else {
 					--fmt;
 				}