Example
/* STRLEN.C */

#include <string.h>
#include <stdio.h>
#include <conio.h>
#include <dos.h>

void main( void )
{
char buffer[61] = "How long am I?";
int len;
len = strlen( buffer );
printf( "'%s' is %d characters long\n", buffer, len );
}

Output
'How long am I?' is 14 characters long

Example
/* STRSTR.C */

#include <string.h>
#include <stdio.h>

char str[] = "lazy";
char string[] = "The quick brown dog jumps over the lazy fox";
char fmt1[] = " 1 2 3 4 5";
char fmt2[] = "12345678901234567890123456789012345678901234567890";

void main( void )
{
char *pdest;
int result;
printf( "String to be searched:\n\t%s\n", string );
printf( "\t%s\n\t%s\n\n", fmt1, fmt2 );
pdest = strstr( string, str );
result = pdest - string + 1;
if( pdest != NULL )
printf( "%s found at position %d\n\n", str, result );
else
printf( "%s not found\n", str );
}

Output
String to be searched:
The quick brown dog jumps over the lazy fox
1 2 3 4 5
12345678901234567890123456789012345678901234567890

lazy found at position 36

Example
/* STRCSPN.C */

#include <string.h>
#include <stdio.h>

void main( void )
{
char string[] = "xyzabc";
int pos;

pos = strcspn( string, "abc" );
printf( "First a, b or c in %s is at character %d\n",
string, pos );
}
Output
First a, b or c in xyzabc is at character 3

Example
/* STRSPN.C: This program uses strspn to determine
* the length of the segment in the string "cabbage"
* consisting of a's, b's, and c's. In other words,
* it finds the first non-abc letter.
*/

#include <string.h>
#include <stdio.h>

void main( void )
{
char string[] = "cabbage";
int result;
result = strspn( string, "abc" );
printf( "The portion of '%s' containing only a, b, or c "
"is %d bytes long\n", string, result );
}

Output
The portion of 'cabbage' containing only a, b, or c is 5 bytes long

Warning Each of these functions uses a static variable for parsing the string into tokens. If multiple or simultaneous calls are made to the same function, a high potential for data corruption and inaccurate results exists. Therefore, do not attempt to call the same function simultaneously for different strings and be aware of calling one of these function from within a loop where another routine may be called that uses the same function. However, calling this function simultaneously from multiple threads does not have undesirable effects.

Subject: String Manipulation Routines
Keywords: See Also strcspn, strspn, setlocale

Example
/* STRTOK.C: In this program, a loop uses strtok
* to print all the tokens (separated by commas
* or blanks) in the string named "string".
*/

#include <string.h>
#include <stdio.h>

char string[] = "A string\tof ,,tokens\nand some more tokens";
char seps[] = " ,\t\n";
char *token;

void main( void )
{
printf( "%s\n\nTokens:\n", string );
/* Establish string and get the first token: */
token = strtok( string, seps );
while( token != NULL )
{
/* While there are tokens in "string" */
printf( " %s\n", token );
/* Get next token: */
token = strtok( NULL, seps );
}
}

Output
A string of ,,tokens
and some more tokens

Tokens:
A
string
of
tokens
and
some
more
tokens