lsquic_str.c revision 2f4629f2 
1/* Copyright (c) 2017 - 2020 LiteSpeed Technologies Inc.  See LICENSE. */
2/*
3 * lsquic_str.c
4 *
5 */
6
7#include <stdlib.h>
8#include <string.h>
9
10#include "lsquic_str.h"
11
12
13lsquic_str_t *
14lsquic_str_new (const char *str, size_t sz)
15{
16    lsquic_str_t *lstr;
17    char *copy;
18
19    if (str && sz)
20    {
21        copy = malloc(sz + 1);
22        if (!copy)
23            return NULL;
24        memcpy(copy, str, sz);
25        copy[sz] = '\0';
26    }
27    else
28        copy = NULL;
29
30    lstr = malloc(sizeof(*lstr));
31    if (!lstr)
32    {
33        free(copy);
34        return NULL;
35    }
36    lstr->str = copy;
37    lstr->len = sz;
38
39    return lstr;
40}
41
42
43void
44lsquic_str_setto (lsquic_str_t *lstr, const void *str, size_t len)
45{
46    if (lsquic_str_len(lstr) > 0)
47        lsquic_str_d(lstr);
48    lsquic_str_append(lstr, str, len);
49}
50
51
52int
53lsquic_str_append (lsquic_str_t *lstr, const char *str, size_t len)
54{
55    size_t newlen;
56    char *newstr;
57
58    newlen = lstr->len + len;
59    newstr = realloc(lstr->str, newlen + 1);
60    if (!newstr)
61        return -1;
62
63    memcpy(newstr + lstr->len, str, len);
64    newstr[newlen] = '\0';
65    lstr->str = newstr;
66    lstr->len = newlen;
67    return 0;
68}
69
70
71void
72lsquic_str_d (lsquic_str_t *lstr)
73{
74    if (lstr) {
75        free(lstr->str);
76        lstr->str = NULL;
77        lstr->len = 0;
78    }
79}
80
81
82void
83lsquic_str_delete (lsquic_str_t *lstr)
84{
85    lsquic_str_d(lstr);
86    free(lstr);
87}
88
89
90char *
91lsquic_str_prealloc (lsquic_str_t *lstr, size_t len)
92{
93    char *str;
94
95    str = malloc(len + 1);
96    if (str)
97        lstr->str = str;
98
99    return str;
100}
101
102
103int
104lsquic_str_bcmp (const void *ap, const void *bp)
105{
106    const lsquic_str_t *a = ap, *b = bp;
107    size_t min;
108    int rc;
109
110    min = a->len < b->len ? a->len : b->len;
111    rc = memcmp(a->str, b->str, min);
112    if (rc)
113        return rc;
114    else
115        return (a->len > b->len) - (b->len > a->len);
116}
117
118
119lsquic_str_t *
120lsquic_str_copy (lsquic_str_t *lstr_dst, const lsquic_str_t *lstr_src)
121{
122    char *copy;
123
124    copy = malloc(lstr_src->len + 1);
125    if (!copy)
126    /* Keeping the original behavior: */
127        return NULL;
128
129    memcpy(copy, lstr_src->str, lstr_src->len);
130    copy[lstr_src->len] = '\0';
131    lstr_dst->str = copy;
132    lstr_dst->len = lstr_src->len;
133    return lstr_dst;
134}
135