1 /*
2 * Copyright (C) the libgit2 contributors. All rights reserved.
3 *
4 * This file is part of libgit2, distributed under the GNU GPL v2 with
5 * a Linking Exception. For full terms see the included COPYING file.
6 */
7 #include "parse.h"
8
git_parse_ctx_init(git_parse_ctx * ctx,const char * content,size_t content_len)9 int git_parse_ctx_init(git_parse_ctx *ctx, const char *content, size_t content_len)
10 {
11 if (content && content_len) {
12 ctx->content = content;
13 ctx->content_len = content_len;
14 } else {
15 ctx->content = "";
16 ctx->content_len = 0;
17 }
18
19 ctx->remain = ctx->content;
20 ctx->remain_len = ctx->content_len;
21 ctx->line = ctx->remain;
22 ctx->line_len = git__linenlen(ctx->line, ctx->remain_len);
23 ctx->line_num = 1;
24
25 return 0;
26 }
27
git_parse_ctx_clear(git_parse_ctx * ctx)28 void git_parse_ctx_clear(git_parse_ctx *ctx)
29 {
30 memset(ctx, 0, sizeof(*ctx));
31 ctx->content = "";
32 }
33
git_parse_advance_line(git_parse_ctx * ctx)34 void git_parse_advance_line(git_parse_ctx *ctx)
35 {
36 ctx->line += ctx->line_len;
37 ctx->remain_len -= ctx->line_len;
38 ctx->line_len = git__linenlen(ctx->line, ctx->remain_len);
39 ctx->line_num++;
40 }
41
git_parse_advance_chars(git_parse_ctx * ctx,size_t char_cnt)42 void git_parse_advance_chars(git_parse_ctx *ctx, size_t char_cnt)
43 {
44 ctx->line += char_cnt;
45 ctx->remain_len -= char_cnt;
46 ctx->line_len -= char_cnt;
47 }
48
git_parse_advance_expected(git_parse_ctx * ctx,const char * expected,size_t expected_len)49 int git_parse_advance_expected(
50 git_parse_ctx *ctx,
51 const char *expected,
52 size_t expected_len)
53 {
54 if (ctx->line_len < expected_len)
55 return -1;
56
57 if (memcmp(ctx->line, expected, expected_len) != 0)
58 return -1;
59
60 git_parse_advance_chars(ctx, expected_len);
61 return 0;
62 }
63
git_parse_advance_ws(git_parse_ctx * ctx)64 int git_parse_advance_ws(git_parse_ctx *ctx)
65 {
66 int ret = -1;
67
68 while (ctx->line_len > 0 &&
69 ctx->line[0] != '\n' &&
70 git__isspace(ctx->line[0])) {
71 ctx->line++;
72 ctx->line_len--;
73 ctx->remain_len--;
74 ret = 0;
75 }
76
77 return ret;
78 }
79
git_parse_advance_nl(git_parse_ctx * ctx)80 int git_parse_advance_nl(git_parse_ctx *ctx)
81 {
82 if (ctx->line_len != 1 || ctx->line[0] != '\n')
83 return -1;
84
85 git_parse_advance_line(ctx);
86 return 0;
87 }
88
git_parse_advance_digit(int64_t * out,git_parse_ctx * ctx,int base)89 int git_parse_advance_digit(int64_t *out, git_parse_ctx *ctx, int base)
90 {
91 const char *end;
92 int ret;
93
94 if (ctx->line_len < 1 || !git__isdigit(ctx->line[0]))
95 return -1;
96
97 if ((ret = git__strntol64(out, ctx->line, ctx->line_len, &end, base)) < 0)
98 return -1;
99
100 git_parse_advance_chars(ctx, (end - ctx->line));
101 return 0;
102 }
103
git_parse_advance_oid(git_oid * out,git_parse_ctx * ctx)104 int git_parse_advance_oid(git_oid *out, git_parse_ctx *ctx)
105 {
106 if (ctx->line_len < GIT_OID_HEXSZ)
107 return -1;
108 if ((git_oid_fromstrn(out, ctx->line, GIT_OID_HEXSZ)) < 0)
109 return -1;
110 git_parse_advance_chars(ctx, GIT_OID_HEXSZ);
111 return 0;
112 }
113
git_parse_peek(char * out,git_parse_ctx * ctx,int flags)114 int git_parse_peek(char *out, git_parse_ctx *ctx, int flags)
115 {
116 size_t remain = ctx->line_len;
117 const char *ptr = ctx->line;
118
119 while (remain) {
120 char c = *ptr;
121
122 if ((flags & GIT_PARSE_PEEK_SKIP_WHITESPACE) &&
123 git__isspace(c)) {
124 remain--;
125 ptr++;
126 continue;
127 }
128
129 *out = c;
130 return 0;
131 }
132
133 return -1;
134 }
135