How can I get rid of "\ n" from a string in c?

Question

I am using the ascitime function in C

#include <time.h> char *asctime(const struct tm *timeptr); returns something like: Sun Sep 16 01:03:52 1973\n\0 

It returns this "string" (respectively char *):

Sun Sep 16 01:03:52 1973 \ n \ 0

How can I get rid of "\ n" from this line? I do not need the next line that calls "\ n". thanks

Answer 1

Other answers seem complicated. Your case is simple because you know that the unwanted character is the last in the string.

 char *foo = asctime(); foo[strlen(foo) - 1] = 0; 

This returns the desired character (\ n).

Answer 2

After accepting the answer

the accepted answer seems complicated. asctime() returns a pointer to a fixed-size array of 26 in the form:

 > Sun Sep 16 01:03:52 1973\n\0 > 0123456789012345678901234455 char *timetext = asctime(some_timeptr); timetext[24] = '\0'; // being brave (and foolish) with no error checking 

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A general solution to removing a potential (final) '\n' that is more resistant to unusual strings would be:

 char *some_string = foo(); char *p = strchr(str, '\n'); // finds first, if any, \n if (p != NULL) *p = '\0'; // or size_t len = strlen(str); if (len > 0 && str[len-1] == '\n') str[--len] = '\0'; 

str[strlen(str) - 1] not safe until strlen(STR) > 0 is first set.

Answer 3

Why not use printf with maximum width? seeing what you still call printf ...

 static void debug_printf(const char *format, ...) { va_list arglist; time_t rawtime; struct tm * timeinfo; time ( &rawtime ); timeinfo = localtime ( &rawtime ); printf ( "%.24s: ", asctime (timeinfo) ); va_start( arglist, format ); vprintf( format, arglist ); va_end( arglist ); } 

Answer 4

you can use strtok to split the string by "\n" and concatenate the tokens.

Answer 5

As far as I know, you cannot force it to return a string without a new string. You just need to disable \n with the base loop.

 int i; for(i = 0;; i++) { if(str[i] == '\n') { str[i] = '\0'; break; } } 

Alternatively, you can read the information manually from tm struct .

Answer 6

If you want to do this with 1 line of code:

 printf("The time is: %s.", strtok(asctime(timeinfo), "\n"));