1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*
13 * Copyright 2019 Joyent, Inc.
14 */
15
16 #include <string.h>
17 #include <sys/types.h>
18 #include <sys/debug.h>
19 #include "strview.h"
20
21 void
sv_init_sv(strview_t * sv,const strview_t * src)22 sv_init_sv(strview_t *sv, const strview_t *src)
23 {
24 *sv = *src;
25 }
26
27 void
sv_init_sv_range(strview_t * sv,const strview_t * src,size_t len)28 sv_init_sv_range(strview_t *sv, const strview_t *src, size_t len)
29 {
30 VERIFY3U(sv_remaining(src), >=, len);
31
32 sv->sv_first = src->sv_first;
33 sv->sv_last = src->sv_first + len;
34 sv->sv_rem = len;
35 }
36
37 void
sv_init_str(strview_t * sv,const char * first,const char * last)38 sv_init_str(strview_t *sv, const char *first, const char *last)
39 {
40 if (last == NULL)
41 last = first + strlen(first);
42
43 VERIFY3P(first, <=, last);
44 sv->sv_first = first;
45 sv->sv_last = last;
46 sv->sv_rem = (size_t)(uintptr_t)(sv->sv_last - sv->sv_first);
47 }
48
49 size_t
sv_remaining(const strview_t * sv)50 sv_remaining(const strview_t *sv)
51 {
52 return (sv->sv_rem);
53 }
54
55 boolean_t
sv_consume_if_c(strview_t * sv,char c)56 sv_consume_if_c(strview_t *sv, char c)
57 {
58 if (sv->sv_rem < 1 || *sv->sv_first != c)
59 return (B_FALSE);
60
61 sv->sv_first++;
62 sv->sv_rem--;
63 return (B_TRUE);
64 }
65
66 boolean_t
sv_consume_if(strview_t * sv,const char * str)67 sv_consume_if(strview_t *sv, const char *str)
68 {
69 size_t slen = strlen(str);
70
71 if (sv->sv_rem < slen)
72 return (B_FALSE);
73 if (strncmp(sv->sv_first, str, slen) != 0)
74 return (B_FALSE);
75
76 sv->sv_first += slen;
77 sv->sv_rem -= slen;
78 return (B_TRUE);
79 }
80
81 char
sv_peek(const strview_t * sv,ssize_t n)82 sv_peek(const strview_t *sv, ssize_t n)
83 {
84 const char *p;
85
86 p = (n >= 0) ? sv->sv_first + n : sv->sv_last + n;
87 return ((p >= sv->sv_first && p < sv->sv_last) ? *p : '\0');
88 }
89
90 char
sv_consume_c(strview_t * sv)91 sv_consume_c(strview_t *sv)
92 {
93 char c = '\0';
94
95 if (sv->sv_first < sv->sv_last) {
96 c = *sv->sv_first++;
97 sv->sv_rem--;
98 }
99 return (c);
100 }
101
102 void
sv_consume_n(strview_t * sv,size_t n)103 sv_consume_n(strview_t *sv, size_t n)
104 {
105 VERIFY3U(sv->sv_rem, >=, n);
106 sv->sv_first += n;
107 sv->sv_rem -= n;
108 }
109