record: skip whitespaces after shebang for scripts

Python tracing won't work when the shebang line has a space like below:

" #! /usr/bin/env python3 "

This patch makes uftrace to understand the above shebang as well.

Fixed: namhyung#1690

Signed-off-by: Gabriel Kim <[email protected]>

Author: GabrielKimm

utils/utils.c

@@ -598,30 +598,43 @@ char *strjoin(char *left, char *right, const char *delim)
  * str_trim - to trim all spaces
  * @str: input string
  *
- * This function make @str to right trimmed @str
+ * This function make @str to all trimmed @str
  */
 char *str_trim(char *str)
 {
-	int i = 0;
-	int j = 0;
-	bool spaceFound = false;
+	str = str_ltrim(str);
+	str = str_rtrim(str);
+	return str;
+}
 
+/**
+ * str_ltrim - to trim left spaces
+ * @str: input string
+ *
+ * This function make @str to left trimmed @str
+ */
+char *str_ltrim(char *str)
+{
 	if (!str)
 		return NULL;
-
-	while (str[j]) {
-		if (str[j] != ' ' || !spaceFound) {
-			str[i] = str[j];
-			i++;
-			spaceFound = (str[j] == ' ');
-		}
-		j++;
+	while (isspace((unsigned char)*str)) {
+		str++;
 	}
+	return str;
+}
 
-	if (i > 0 && str[i - 1] == ' ')
-		i--;
-
-	str[i] = '\0';
+/**
+ * str_rtrim - to trim right spaces
+ * @str: input string
+ *
+ * This function make @str to right trimmed @str
+ */
+char *str_rtrim(char *str)
+{
+	char *p = strchr(str, '\0');
+	while (--p >= str && isspace(*p))
+		;
+	*(p + 1) = '\0';
 	return str;
 }
 

utils/utils.h

@@ -390,6 +390,8 @@ void strv_replace(struct strv *strv, int idx, const char *str);
 char *strv_join(struct strv *strv, const char *delim);
 void strv_free(struct strv *strv);
 char *str_trim(char *str);
+char *str_ltrim(char *str);
+char *str_rtrim(char *str);
 
 char **parse_cmdline(char *cmd, int *argc);
 void free_parsed_cmdline(char **argv);