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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2019, Joyent, Inc.
*/
#include <string.h>
#include <sys/debug.h>
#include "strview.h"
void
sv_init_sv(strview_t *sv, const strview_t *src)
{
*sv = *src;
}
void
sv_init_sv_range(strview_t *sv, const strview_t *src, size_t len)
{
VERIFY3U(sv_remaining(src), >=, len);
sv->sv_first = src->sv_first;
sv->sv_last = src->sv_first + len;
sv->sv_rem = len;
}
void
sv_init_str(strview_t *sv, const char *first, const char *last)
{
if (last == NULL)
last = first + strlen(first);
VERIFY3P(first, <=, last);
sv->sv_first = first;
sv->sv_last = last;
sv->sv_rem = (size_t)(uintptr_t)(sv->sv_last - sv->sv_first);
}
size_t
sv_remaining(const strview_t *sv)
{
return (sv->sv_rem);
}
boolean_t
sv_consume_if_c(strview_t *sv, char c)
{
if (sv->sv_rem < 1 || *sv->sv_first != c)
return (B_FALSE);
sv->sv_first++;
sv->sv_rem--;
return (B_TRUE);
}
boolean_t
sv_consume_if(strview_t *sv, const char *str)
{
size_t slen = strlen(str);
if (sv->sv_rem < slen)
return (B_FALSE);
if (strncmp(sv->sv_first, str, slen) != 0)
return (B_FALSE);
sv->sv_first += slen;
sv->sv_rem -= slen;
return (B_TRUE);
}
char
sv_peek(const strview_t *sv, ssize_t n)
{
const char *p;
p = (n >= 0) ? sv->sv_first + n : sv->sv_last + n;
return ((p >= sv->sv_first && p < sv->sv_last) ? *p : '\0');
}
char
sv_consume_c(strview_t *sv)
{
char c = '\0';
if (sv->sv_first < sv->sv_last) {
c = *sv->sv_first++;
sv->sv_rem--;
}
return (c);
}
void
sv_consume_n(strview_t *sv, size_t n)
{
VERIFY3U(sv->sv_rem, >=, n);
sv->sv_first += n;
sv->sv_rem -= n;
}
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