Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#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;
}