<string.h>

<string.h> provides null-terminated string functions (strlen, strcpy, strcat, strcmp) and memory operations (memcpy, memmove, memset). Avoid strcpy/strcat (unsafe); use bounded variants or snprintf instead.

The mem* functions work on raw bytes; the str* functions assume null termination.

This example tokenizes a CSV line using strtok and measures each field.

// compile: gcc -o stringexample stringexample.c
// run: ./stringexample
// description: tokenize CSV line by comma and print each field
 
#include <string.h>
#include <stdio.h>
 
int main() {
    char line[] = "alice,30,engineer,london";
    char* tok = strtok(line, ",");
    int field = 0;
 
    while (tok) {
        printf("field %d: \"%s\" (len %zu)\n", field++, tok, strlen(tok));
        tok = strtok(NULL, ",");
    }
 
    return 0;
}