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2a3e3873a1
Level up WARNS
176 lines
4.2 KiB
C
176 lines
4.2 KiB
C
/*
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* $Id: columns.c,v 1.10 2011/10/20 20:53:55 tom Exp $
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*
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* columns.c -- implements column-alignment
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*
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* Copyright 2008-2010,2011 Thomas E. Dickey
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License, version 2.1
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to
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* Free Software Foundation, Inc.
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* 51 Franklin St., Fifth Floor
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* Boston, MA 02110, USA.
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*/
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#include <dialog.h>
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#define each(row, data) \
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row = 0, data = target; \
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row < num_rows; \
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++row, data = next_row(data, per_row)
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static char *
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column_separator(void)
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{
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char *result = 0;
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if ((result = dialog_vars.column_separator) != 0) {
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if (*result == '\0')
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result = 0;
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}
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return result;
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}
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static char **
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next_row(char **target, int per_row)
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{
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char *result = (char *) target;
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result += per_row;
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return (char **) (void *) result;
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}
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static char *
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next_col(char *source, unsigned offset)
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{
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char *mark = column_separator();
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char *result = source + offset;
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if (offset)
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result += strlen(mark);
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return strstr(result, mark);
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}
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/*
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* Parse the source string, storing the offsets and widths of each column in
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* the corresponding arrays. Return the number of columns.
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*/
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static unsigned
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split_row(char *source, unsigned *offsets, unsigned *widths)
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{
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int mark = (int) strlen(column_separator());
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char *next = 0;
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unsigned result = 0;
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unsigned offset = 0;
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do {
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if (result) {
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offset = (unsigned) (mark + next - source);
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widths[result - 1] = offset - offsets[result - 1] - (unsigned) mark;
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}
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offsets[result] = offset;
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++result;
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} while ((next = next_col(source, offset)) != 0);
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offset = (unsigned) strlen(source);
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widths[result - 1] = offset - offsets[result - 1];
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return result;
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}
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/*
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* The caller passes a pointer to a struct or array containing pointers
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* to strings that we may want to copy and reformat according to the column
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* separator.
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*/
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void
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dlg_align_columns(char **target, int per_row, int num_rows)
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{
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int row;
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if (column_separator()) {
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char **value;
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unsigned numcols = 1;
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size_t maxcols = 0;
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unsigned *widths;
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unsigned *offsets;
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unsigned *maxwidth;
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unsigned realwidth;
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unsigned n;
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/* first allocate arrays for workspace */
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for (each(row, value)) {
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size_t len = strlen(*value);
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if (maxcols < len)
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maxcols = len;
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}
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++maxcols;
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widths = dlg_calloc(unsigned, maxcols);
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offsets = dlg_calloc(unsigned, maxcols);
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maxwidth = dlg_calloc(unsigned, maxcols);
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assert_ptr(widths, "dlg_align_columns");
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assert_ptr(offsets, "dlg_align_columns");
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assert_ptr(maxwidth, "dlg_align_columns");
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/* now, determine the number of columns and the column-widths */
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for (each(row, value)) {
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unsigned cols = split_row(*value, offsets, widths);
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if (numcols < cols)
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numcols = cols;
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for (n = 0; n < cols; ++n) {
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if (maxwidth[n] < widths[n])
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maxwidth[n] = widths[n];
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}
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}
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realwidth = numcols - 1;
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for (n = 0; n < numcols; ++n) {
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realwidth += maxwidth[n];
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}
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/* finally, construct reformatted strings */
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for (each(row, value)) {
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unsigned cols = split_row(*value, offsets, widths);
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unsigned offset = 0;
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char *text = dlg_malloc(char, realwidth + 1);
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assert_ptr(text, "dlg_align_columns");
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memset(text, ' ', (size_t) realwidth);
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for (n = 0; n < cols; ++n) {
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memcpy(text + offset, *value + offsets[n], (size_t) widths[n]);
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offset += maxwidth[n] + 1;
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}
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text[realwidth] = 0;
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*value = text;
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}
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free(widths);
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free(offsets);
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free(maxwidth);
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}
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}
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/*
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* Free temporary storage used while making column-aligned data.
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*/
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void
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dlg_free_columns(char **target, int per_row, int num_rows)
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{
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int row;
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char **value;
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if (column_separator()) {
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for (each(row, value)) {
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free(*value);
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}
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}
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}
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