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#include "str.h"
/*
The 'str_len(s)' function calculates the length of the string 's'.
*/
long long str_len(const char *s) {
long long i;
for (i = 0; s[i]; ++i);
return i;
}
/*
The 'str_start(s,t)' function returns 1 if t is a prefix of s, 0 otherwise.
*/
int str_start(const char *s, const char *t) {
char x;
for (;;) {
x = *t++;
if (!x) return 1;
if (x != *s++) return 0;
}
}
/*
The 'str_equaln(y,ylen,x)' function returns 1 if the length of string 'x' is
ylen and if y and x match up to, 0 otherwise.
*/
int str_equaln(const char *y, long long ylen, const char *x) {
long long i;
if (str_len(x) != ylen) return 0;
for (i = 0; i < ylen; ++i)
if (y[i] != x[i]) return 0;
return 1;
}
/*
The 'str_copyn(y,ylen,x)' function copies the string pointed to by 'x'
(including \0) to the buffer pointed to by 'y'. If the length of string x is
smaller than ylen or equal, then function returns 1. If the length of string x
is biger than ylen, then only ylen - 1 bytes of 'x' are copied and function
returns 0. The 'y' string is always \0 terminated.
*/
int str_copyn(char *y, long long ylen, const char *x) {
long long len = str_len(x);
int ret = 1;
if (ylen <= 0) return 0;
if (ylen - 1 < len) {
len = ylen - 1;
ret = 0;
}
y[len] = 0;
while (len > 0) {
*y++ = *x++;
--len;
}
return ret;
}
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