Split C string into tokens using sscanf
Solution 1
Here is a solution that seems to work:
char *contents = "content=0&website=Google";
char arg[100] = {0};
char value[100] = {0};
sscanf(contents, "%[^&]&%s", arg, value);
printf("%s\n%s\n", arg, value);
Solution 2
scanf
is more primitive than you seem to think — %s
will match everything up to the next whitespace. Your best solution is probably to stick with strtok
but throw it only content you've strdup
ed from the authoritative original.
Rio
Stanford CS grad student, compulsive hacker, bitten by the startup bug.
Updated on March 06, 2020Comments
-
Rio about 4 years
I'm trying to split a string into tokens but somewhat recursively. I am trying to parse:
"content=0&website=Google"
so that I have a way to take out the parameters and values. If I try
strtok
I end up destroying the string I want to parse twice. So I triedchar *contents = "content=0&website=Google" char arg[100]; char value[100]; sscanf(contents, "%s&%s", arg, value);
as a first pass, hoping to parse
arg
again, but it fails, andarg
contains the entire string. I tried using"%s\&%s"
thinking&
was a reserved word, but no luck there.Help!
Edit:
This was my strtok hack:
static void readParams(char * string, char * param, char * value) { printf("This is the string %s\n",string); char * splitted = strtok (string,"="); while (splitted != NULL) { printf("This is the string %s\n",splitted); splitted = strtok (NULL, "="); // Then do some saving to param and value } } char * splitted = strtok (contents,"&"); int counter = 0; while (splitted != NULL) { char * t_str = strdup(splitted); readParams(t_str, param, value); splitted = strtok (NULL, "&"); }
but it doesn't work because splitted's
strtok
at the end becomes gobbldygook.