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
|
/*
* $Id: columns.c,v 1.14 2025/01/09 22:33:20 tom Exp $
*
* columns.c -- implements column-alignment
*
* Copyright 2008-2024,2025 Thomas E. Dickey
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License, version 2.1
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to
* Free Software Foundation, Inc.
* 51 Franklin St., Fifth Floor
* Boston, MA 02110, USA.
*/
#include <dlg_internals.h>
#define each(row, data) \
row = 0, data = target; \
row < num_rows; \
++row, data = next_row(data, per_row)
static char *
column_separator(void)
{
char *result = NULL;
if ((result = dialog_vars.column_separator) != NULL) {
if (*result == '\0')
result = NULL;
}
return result;
}
static char **
next_row(char **target, int per_row)
{
char *result = (char *) target;
result += per_row;
return (char **) (void *) result;
}
static char *
next_col(char *source, unsigned offset)
{
const char *mark = column_separator();
char *result = source + offset;
if (offset)
result += strlen(mark);
return strstr(result, mark);
}
/*
* Parse the source string, storing the offsets and widths of each column in
* the corresponding arrays. Return the number of columns.
*/
static unsigned
split_row(char *source, unsigned *offsets, unsigned *widths)
{
int mark = (int) strlen(column_separator());
char *next = NULL;
unsigned result = 0;
unsigned offset = 0;
do {
if (result) {
offset = (unsigned) (mark + next - source);
widths[result - 1] = offset - offsets[result - 1] - (unsigned) mark;
}
offsets[result] = offset;
++result;
} while ((next = next_col(source, offset)) != NULL);
offset = (unsigned) strlen(source);
widths[result - 1] = offset - offsets[result - 1];
return result;
}
/*
* The caller passes a pointer to a struct or array containing pointers
* to strings that we may want to copy and reformat according to the column
* separator.
*/
void
dlg_align_columns(char **target, int per_row, int num_rows)
{
if (column_separator()) {
char **value;
unsigned numcols = 1;
size_t maxcols = 0;
unsigned *widths;
unsigned *offsets;
unsigned *maxwidth;
unsigned realwidth;
unsigned n;
int row;
/* first allocate arrays for workspace */
for (each(row, value)) {
size_t len = strlen(*value);
if (maxcols < len)
maxcols = len;
}
++maxcols;
widths = dlg_calloc(unsigned, maxcols);
offsets = dlg_calloc(unsigned, maxcols);
maxwidth = dlg_calloc(unsigned, maxcols);
assert_ptr(widths, "dlg_align_columns");
assert_ptr(offsets, "dlg_align_columns");
assert_ptr(maxwidth, "dlg_align_columns");
/* now, determine the number of columns and the column-widths */
for (each(row, value)) {
unsigned cols = split_row(*value, offsets, widths);
if (numcols < cols)
numcols = cols;
for (n = 0; n < cols; ++n) {
if (maxwidth[n] < widths[n])
maxwidth[n] = widths[n];
}
}
realwidth = numcols - 1;
for (n = 0; n < numcols; ++n) {
realwidth += maxwidth[n];
}
/* finally, construct reformatted strings */
for (each(row, value)) {
unsigned cols = split_row(*value, offsets, widths);
unsigned offset = 0;
char *text = dlg_malloc(char, realwidth + 1);
assert_ptr(text, "dlg_align_columns");
memset(text, ' ', (size_t) realwidth);
for (n = 0; n < cols; ++n) {
memcpy(text + offset, *value + offsets[n], (size_t) widths[n]);
offset += maxwidth[n] + 1;
}
text[realwidth] = 0;
*value = text;
}
free(widths);
free(offsets);
free(maxwidth);
}
}
/*
* Free temporary storage used while making column-aligned data.
*/
void
dlg_free_columns(char **target, int per_row, int num_rows)
{
if (column_separator()) {
int row;
char **value;
for (each(row, value)) {
free(*value);
}
}
}
|
