Remove text from string after a certain character in C

c string char strip ansi-c
William Fernandes picture William Fernandes · Jun 20, 2016 · Viewed 7k times · Source

I am reading lines from a file, the lines look like this:

89f81a03eb30a03c8708dde38cf:000391716

The thing is: I want to remove everything after the : (including the :). I tried everything I could find online but they seem to use const char and the lines are char pointers.

Answer

David Ranieri picture David Ranieri · Jun 20, 2016

You can use strchr:

char str[] = "89f81a03eb30a03c8708dde38cf:000391716";
char *ptr;

ptr = strchr(str, ':');
if (ptr != NULL) {
    *ptr = '\0';
}

Related questions

What is the difference between char s[] and char *s?

In C, one can use a string literal in a declaration like this: char s[] = "hello"; or like this: char *s = "hello"; So what is the difference? I want to know what actually happens in terms of storage duration, both …

Read More
Return char[]/string from a function

Im fairly new to coding in C and currently im trying to create a function that returns a c string/char array and assigning to a variable. So far, ive observed that returning a char * is the most common solution. …

Read More
Why is conversion from string constant to 'char*' valid in C but invalid in C++

The C++11 Standard (ISO/IEC 14882:2011) says in § C.1.1: char* p = "abc"; // valid in C, invalid in C++ For the C++ it's OK as a pointer to a String Literal is harmful since any attempt to modify it leads to a …

Read More