Implementing strsep() on MSP430 wihtout MSPGCC?

Bryce Salmi

I simply need to perform parsing of strings that have consecutive delimiters "foo,foo1,,foo3" and want to implement a version of strsep(). I'm using the standard TI libraries at this time. Therefore I've tried to implement a form of:

char * strsep(char **stringp, const char *delim);

I then pass the address of a char array GPS_GGA to it

strcpy(GGA_Data.Sync, strsep(&GPS_GGA,","));
strcpy(GGA_Data.Time, strsep(NULL,","));

I am warned that

 #169-D argument of type "char (*)[80]" is incompatible with parameter of type 
	 "char **"

When I look at the values in the struct of GGA_Data none of the data is present. this method works fine with strtok() from the TI string.h but cannot handle the consecutive delimiters.

Am I simply incorrectly using C on the MSP430 to implement this function? I feel like it's staring me in the face but I can't see why it isn't working.

over 10 years ago

0 Clemens Ladisch over 10 years ago

Guru 324950 points

strsep() wants to change its first parameter; this is not possible with a plain char array. You need a separate pointer that points to the first character in the array.

0 Bryce Salmi over 10 years ago in reply to Clemens Ladisch

Intellectual 310 points

OK this is on the correct track. I believe the following is correct:

		char *strcopy = strdup(GPS_GGA); // make a copy of a literal
		strcpy(GGA_Data.Sync, strsep(&strcopy,","));

The above works and it makes sense, I was being stupid. Lesson learned!

Should it be necessary to use free() to ensure memory leaks don't happen?

0 Bryce Salmi over 10 years ago in reply to Bryce Salmi

Intellectual 310 points

I feel like I can't reliably get strdup to return a pointer. I often get NULL... Why would I fail to allocate the space? I don't believe I'm using all the memory or even close.

0 Tony Philipsson over 10 years ago in reply to Bryce Salmi

Guru 12050 points

strtok() is good to use when to parse a text string that has delimiters.
It does not copy anything but instead replace the delimiter with a zero so when you use the token-pointer it is a "broken up string".
I have used it in both CCS and IAR
www.tutorialspoint.com/.../c_function_strtok.htm

**Attention** This is a public forum

MSP low-power microcontrollers

MSP low-power microcontroller forum

Implementing strsep() on MSP430 wihtout MSPGCC?