You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
#include <str.h>
|
|
#include <buffer.h>
|
|
|
|
/*
|
|
* The str_* functions have a pretty similar functionality to the byte_* ones
|
|
* -- the most important enhacement is the recognition of \0.
|
|
*/
|
|
|
|
int
|
|
main()
|
|
{
|
|
char *string1 = "foo bar";
|
|
char string2[42] = "fnord";
|
|
unsigned int len;
|
|
unsigned int amm;
|
|
unsigned int pos;
|
|
int diff;
|
|
int start;
|
|
|
|
/* For determinating the difference between two strings, thew libowfat
|
|
* offers two functions:
|
|
*
|
|
* int str_diff(const char *a,const char *b);
|
|
*
|
|
* and
|
|
*
|
|
* int str_diffn(const char *a,const char *b,unsigned int limit);
|
|
*
|
|
* They both return <0 if a is lexicographically smaller than b, 0 if they
|
|
* are equal and >0 if b is greater than a. The only difference is that
|
|
* str_diff compares everytime until a \0 is encountered and str_diffn
|
|
* compares max. until limit. Beware of checking just for 1 and -1!
|
|
*/
|
|
|
|
diff = str_diff(string1, string2);
|
|
|
|
buffer_puts(buffer_1, "str_diff(string1, string2): ");
|
|
buffer_putlong(buffer_1, diff);
|
|
buffer_putnlflush(buffer_1);
|
|
|
|
|
|
/* As in byte_diff(), there is a macro str_equal(a,b) for convience. */
|
|
|
|
/* For the frequent task of testing whether a string starts with an another
|
|
* is the following function:
|
|
*
|
|
* int str_start(const char *a,const char *b);
|
|
*
|
|
* It simply returns 1 if a starts with b and 0 otherwise.
|
|
*/
|
|
|
|
start = str_start(string1, "foo");
|
|
|
|
buffer_puts(buffer_1, "str_start(string1, \"foo\"): ");
|
|
buffer_putlong(buffer_1, start);
|
|
buffer_putnlflush(buffer_1);
|
|
|
|
|
|
/* Determinating the length of a string is also easy with the libowfat:
|
|
*
|
|
* unsigned int str_len(const char *s);
|
|
*
|
|
* returns the index of \0 in the string and that's also the length.
|
|
*/
|
|
|
|
len = str_len(string1);
|
|
|
|
buffer_puts(buffer_1, "str_len(buffer_1): ");
|
|
buffer_putulong(buffer_1, len);
|
|
buffer_putnlflush(buffer_1);
|
|
|
|
|
|
/* One of the most used ANSI-C-functions is strcpy() and the libowfat has
|
|
* an own version:
|
|
*
|
|
* unsigned int str_copy(char *out,const char *in);
|
|
*
|
|
* It copies "in" into "out" until the first \0 is copied and returns the
|
|
* number of bytes copied.
|
|
*/
|
|
|
|
amm = str_copy(string2, string1); /* Returns 7, string2 now begins with "foo bar\0". */
|
|
|
|
buffer_puts(buffer_1, "str_copy(string1, string2): ");
|
|
buffer_putulong(buffer_1, amm);
|
|
buffer_putnlflush(buffer_1);
|
|
|
|
|
|
/* Similar to byte_* there are:
|
|
*
|
|
* unsigned int str_chr(const char *haystack,char needle);
|
|
*
|
|
* and
|
|
*
|
|
* unsigned int str_rchr(const char *haystack,char needle);
|
|
*
|
|
* The first one returns the index of the _first_ occurency of "needle" in
|
|
* "haystack" and the second returns the last one. Both return the index of
|
|
* \0 if the "needle" hasn't been found.
|
|
*/
|
|
|
|
pos = str_chr(string1, 'b'); /* Returns 4. */
|
|
|
|
buffer_puts(buffer_1, "str_chr(string1, 'b'): ");
|
|
buffer_putulong(buffer_1, pos);
|
|
buffer_putnlflush(buffer_1);
|
|
|
|
return 0;
|
|
}
|