1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
#include <stdlib.h>
#include <errno.h>
#include <mailutils/types.h>
#include <mailutils/locus.h>
#include <mailutils/error.h>
struct mu_locus_track
{
char const *file_name; /* Name of the source file */
size_t max_lines; /* Max. number of lines history kept by tracker */
size_t head; /* Bottom of stack */
size_t level; /* Number of elements on stack */
unsigned hline; /* Number of line corresponding to cols[head] */
unsigned *cols; /* Cyclic stack */
};
int
mu_locus_track_create (mu_locus_track_t *ret,
char const *file_name, size_t max_lines)
{
int rc;
struct mu_locus_track *trk;
trk = malloc (sizeof *trk);
if (!trk)
return errno;
trk->cols = calloc (max_lines, sizeof (trk->cols[0]));
if (!trk->cols)
{
rc = errno;
free (trk);
return rc;
}
rc = mu_ident_ref (file_name, &trk->file_name);
if (rc)
{
free (trk->cols);
free (trk);
return rc;
}
if (max_lines < 2)
max_lines = 2;
trk->max_lines = max_lines;
trk->head = 0;
trk->level = 0;
trk->hline = 1;
trk->cols[0] = 0;
*ret = trk;
return 0;
}
void
mu_locus_track_free (mu_locus_track_t trk)
{
if (trk)
{
mu_ident_deref (trk->file_name);
free (trk->cols);
free (trk);
}
}
void
mu_locus_track_destroy (mu_locus_track_t *trk)
{
if (trk)
{
mu_locus_track_free (*trk);
*trk = NULL;
}
}
size_t
mu_locus_track_level (mu_locus_track_t trk)
{
return trk->level;
}
static inline unsigned *
cols_tos_ptr (mu_locus_track_t trk)
{
return &trk->cols[(trk->head + trk->level) % trk->max_lines];
}
static inline unsigned
cols_peek (mu_locus_track_t trk, size_t n)
{
return trk->cols[(trk->head + n) % trk->max_lines];
}
static inline unsigned *
push (mu_locus_track_t trk)
{
unsigned *ptr;
if (trk->level == trk->max_lines)
{
trk->head++;
trk->hline++;
}
else
trk->level++;
*(ptr = cols_tos_ptr (trk)) = 0;
return ptr;
}
static inline unsigned *
pop (mu_locus_track_t trk)
{
if (trk->level == 0)
return NULL;
trk->level--;
return cols_tos_ptr (trk);
}
#ifndef SIZE_MAX
# define SIZE_MAX (~((size_t)0))
#endif
int
mu_locus_tracker_stat (struct mu_locus_track *trk,
struct mu_locus_track_stat *st)
{
size_t i, nch = 0;
for (i = 0; i <= trk->level; i++)
{
unsigned n = cols_peek (trk, i);
if (SIZE_MAX - nch < n)
return ERANGE;
nch += n;
}
st->start_line = trk->hline;
st->n_lines = trk->level;
st->n_chars = nch;
}
void
mu_locus_tracker_advance (struct mu_locus_track *trk,
struct mu_locus_range *loc,
char const *text, size_t leng)
{
unsigned *ptr;
if (text == NULL || leng == 0)
return;
loc->beg.mu_file = loc->end.mu_file = trk->file_name;
loc->beg.mu_line = trk->hline + trk->level;
ptr = cols_tos_ptr (trk);
loc->beg.mu_col = *ptr + 1;
while (leng--)
{
(*ptr)++;
if (*text == '\n')
ptr = push (trk);
text++;
}
if (*ptr)
{
loc->end.mu_line = trk->hline + trk->level;
loc->end.mu_col = *ptr;
}
else
{
/* Text ends with a newline. Keep the previos line number. */
loc->end.mu_line = trk->hline + trk->level - 1;
loc->end.mu_col = cols_peek (trk, trk->level - 1) - 1;
if (loc->end.mu_col + 1 == loc->beg.mu_col)
{
/* This happens if the previous line contained only newline. */
loc->beg.mu_col = loc->end.mu_col;
}
}
}
int
mu_locus_tracker_retreat (struct mu_locus_track *trk, size_t n)
{
struct mu_locus_track_stat st;
mu_locus_tracker_stat (trk, &st);
if (n > st.n_chars)
return ERANGE;
else
{
unsigned *ptr = cols_tos_ptr (trk);
while (n--)
{
if (*ptr == 0)
{
ptr = pop (trk);
if (!ptr || *ptr == 0)
{
mu_error ("%s:%d: INTERNAL ERROR: out of pop back\n",
__FILE__, __LINE__);
return ERANGE;
}
}
--*ptr;
}
}
return 0;
}
|
