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b20a5e9a4d
This is a more concise approach and guarantees there is no time window where the struct is uninitialized. Generated using the following semantic patch: @@ type T; identifier X; @@ - T X; + T X = { 0 }; ... when exists ( - memset(&X, 0, sizeof(X)); | - memset(&X, 0, sizeof(T)); ) Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Claudio Fontana <cfontana@suse.de>
434 lines
10 KiB
C
434 lines
10 KiB
C
/*
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* vsh-table.c: table printing helper
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*
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* Copyright (C) 2018 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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 library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include "vsh-table.h"
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#include <stdarg.h>
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#include <wchar.h>
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#include <wctype.h>
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#include "viralloc.h"
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#include "virbuffer.h"
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#define HEX_ENCODE_LENGTH 4 /* represents length of '\xNN' */
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typedef struct _vshTableRow vshTableRow;
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struct _vshTableRow {
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char **cells;
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size_t ncells;
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};
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struct _vshTable {
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vshTableRow **rows;
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size_t nrows;
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};
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static void
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vshTableRowFree(vshTableRow *row)
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{
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size_t i;
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if (!row)
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return;
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for (i = 0; i < row->ncells; i++)
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g_free(row->cells[i]);
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g_free(row->cells);
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g_free(row);
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}
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void
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vshTableFree(vshTable *table)
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{
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size_t i;
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if (!table)
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return;
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for (i = 0; i < table->nrows; i++)
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vshTableRowFree(table->rows[i]);
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g_free(table->rows);
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g_free(table);
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}
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/**
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* vshTableRowNew:
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* @arg: the first argument.
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* @ap: list of variadic arguments
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*
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* Create a new row in the table. Each argument passed
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* represents a cell in the row.
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*
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* Return: pointer to vshTableRow *row or NULL.
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*/
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static vshTableRow *
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vshTableRowNew(const char *arg, va_list ap)
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{
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vshTableRow *row = NULL;
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if (!arg) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Table row cannot be empty"));
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goto error;
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}
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row = g_new0(vshTableRow, 1);
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while (arg) {
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g_autofree char *tmp = NULL;
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tmp = g_strdup(arg);
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VIR_APPEND_ELEMENT(row->cells, row->ncells, tmp);
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arg = va_arg(ap, const char *);
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}
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return row;
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error:
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vshTableRowFree(row);
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return NULL;
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}
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/**
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* vshTableNew:
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* @arg: List of column names (NULL terminated)
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*
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* Create a new table.
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*
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* Returns: pointer to table or NULL.
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*/
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vshTable *
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vshTableNew(const char *arg, ...)
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{
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vshTable *table = NULL;
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vshTableRow *header = NULL;
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va_list ap;
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table = g_new0(vshTable, 1);
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va_start(ap, arg);
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header = vshTableRowNew(arg, ap);
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va_end(ap);
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if (!header)
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goto error;
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VIR_APPEND_ELEMENT(table->rows, table->nrows, header);
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return table;
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error:
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vshTableRowFree(header);
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vshTableFree(table);
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return NULL;
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}
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/**
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* vshTableRowAppend:
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* @table: table to append to
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* @arg: cells of the row (NULL terminated)
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*
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* Append new row into the @table. The number of cells in the row has
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* to be equal to the number of cells in the table header.
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*
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* Returns: 0 if succeeded, -1 if failed.
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*/
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int
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vshTableRowAppend(vshTable *table, const char *arg, ...)
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{
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vshTableRow *row = NULL;
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size_t ncolumns = table->rows[0]->ncells;
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va_list ap;
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int ret = -1;
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va_start(ap, arg);
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row = vshTableRowNew(arg, ap);
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va_end(ap);
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if (!row)
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goto cleanup;
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if (ncolumns != row->ncells) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Incorrect number of cells in a table row"));
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goto cleanup;
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}
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VIR_APPEND_ELEMENT(table->rows, table->nrows, row);
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ret = 0;
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cleanup:
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vshTableRowFree(row);
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return ret;
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}
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/**
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* Function pulled from util-linux
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*
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* Function's name in util-linux: mbs_safe_encode_to_buffer
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*
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* Returns allocated string where all control and non-printable chars are
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* replaced with \x?? hex sequence, or NULL.
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*/
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static char *
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vshTableSafeEncode(const char *s, size_t *width)
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{
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const char *p = s;
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size_t sz = s ? strlen(s) : 0;
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char *buf;
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char *ret;
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mbstate_t st = { 0 };
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buf = g_new0(char, (sz * HEX_ENCODE_LENGTH) + 1);
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ret = buf;
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*width = 0;
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while (p && *p) {
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if ((*p == '\\' && *(p + 1) == 'x') ||
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g_ascii_iscntrl(*p)) {
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g_snprintf(buf, HEX_ENCODE_LENGTH + 1, "\\x%02x", *p);
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buf += HEX_ENCODE_LENGTH;
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*width += HEX_ENCODE_LENGTH;
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p++;
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} else {
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wchar_t wc;
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size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st);
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if (len == 0)
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break; /* end of string */
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if (len == (size_t) -1 || len == (size_t) -2) {
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len = 1;
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/*
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* Not valid multibyte sequence -- maybe it's
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* printable char according to the current locales.
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*/
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if (!g_ascii_isprint(*p)) {
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g_snprintf(buf, HEX_ENCODE_LENGTH + 1, "\\x%02x", *p);
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buf += HEX_ENCODE_LENGTH;
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*width += HEX_ENCODE_LENGTH;
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} else {
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*buf++ = *p;
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(*width)++;
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}
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} else if (!iswprint(wc)) {
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size_t i;
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for (i = 0; i < len; i++) {
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g_snprintf(buf, HEX_ENCODE_LENGTH + 1, "\\x%02x", p[i]);
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buf += HEX_ENCODE_LENGTH;
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*width += HEX_ENCODE_LENGTH;
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}
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} else {
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memcpy(buf, p, len);
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buf += len;
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*width += g_unichar_iszerowidth(wc) ? 0 : (g_unichar_iswide(wc) ? 2 : 1);
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}
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p += len;
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}
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}
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*buf = '\0';
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return ret;
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}
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/**
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* vshTableGetColumnsWidths:
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* @table: table
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* @maxwidths: maximum count of characters for each columns
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* @widths: count of characters for each cell in the table
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*
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* Fill passed @maxwidths and @widths arrays with maximum number
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* of characters for columns and number of character per each
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* table cell, respectively.
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* Handle unicode strings (user must have multibyte locale)
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*
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* Return 0 in case of success, -1 otherwise.
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*/
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static int
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vshTableGetColumnsWidths(vshTable *table,
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size_t *maxwidths,
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size_t **widths,
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bool header)
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{
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size_t i;
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i = header? 0 : 1;
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for (; i < table->nrows; i++) {
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vshTableRow *row = table->rows[i];
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size_t j;
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for (j = 0; j < row->ncells; j++) {
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size_t size = 0;
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/* need to replace nonprintable and control characters,
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* because width of some of those characters (e.g. \t, \v, \b ...)
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* cannot be counted properly */
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char *tmp = vshTableSafeEncode(row->cells[j], &size);
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if (!tmp)
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return -1;
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VIR_FREE(row->cells[j]);
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row->cells[j] = tmp;
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widths[i][j] = size;
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if (widths[i][j] > maxwidths[j])
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maxwidths[j] = widths[i][j];
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}
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}
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return 0;
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}
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/**
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* vshTableRowPrint:
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* @row: table to append to
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* @maxwidths: maximum count of characters for each columns
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* @widths: count of character for each cell in this row
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* @buf: buffer to store table (only if @toStdout == true)
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*/
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static void
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vshTableRowPrint(vshTableRow *row,
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size_t *maxwidths,
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size_t *widths,
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virBuffer *buf)
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{
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size_t i;
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size_t j;
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for (i = 0; i < row->ncells; i++) {
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virBufferAsprintf(buf, " %s", row->cells[i]);
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if (i < (row->ncells - 1)) {
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for (j = 0; j < maxwidths[i] - widths[i] + 2; j++)
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virBufferAddChar(buf, ' ');
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}
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}
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virBufferAddChar(buf, '\n');
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}
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/**
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* vshTablePrint:
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* @table: table to print
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* @header: whetever to print to header (true) or not (false)
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* this argument is relevant only if @ctl == NULL
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*
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* Get table. To get an alignment of columns right, function
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* fills 2d array @widths with count of characters in each cell and
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* array @maxwidths maximum count of character in each column.
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* Function then prints tables header and content.
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*
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* Return string containing table, or NULL
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*/
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static char *
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vshTablePrint(vshTable *table, bool header)
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{
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size_t i;
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size_t j;
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g_autofree size_t *maxwidths = NULL;
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size_t **widths;
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g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
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char *ret = NULL;
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maxwidths = g_new0(size_t, table->rows[0]->ncells);
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widths = g_new0(size_t *, table->nrows);
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/* retrieve widths of columns */
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for (i = 0; i < table->nrows; i++)
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widths[i] = g_new0(size_t, table->rows[0]->ncells);
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if (vshTableGetColumnsWidths(table, maxwidths, widths, header) < 0)
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goto cleanup;
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if (header) {
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/* print header */
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vshTableRowPrint(table->rows[0], maxwidths, widths[0], &buf);
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/* print dividing line */
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for (i = 0; i < table->rows[0]->ncells; i++) {
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for (j = 0; j < maxwidths[i] + 3; j++)
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virBufferAddChar(&buf, '-');
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}
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virBufferAddChar(&buf, '\n');
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}
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/* print content */
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for (i = 1; i < table->nrows; i++)
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vshTableRowPrint(table->rows[i], maxwidths, widths[i], &buf);
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ret = virBufferContentAndReset(&buf);
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cleanup:
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for (i = 0; i < table->nrows; i++)
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VIR_FREE(widths[i]);
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VIR_FREE(widths);
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return ret;
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}
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/**
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* vshTablePrintToStdout:
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* @table: table to print
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* @ctl virtshell control structure
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*
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* Print table returned in string to stdout.
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* If effect on vshControl structure on printing function changes in future
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* (apart from quiet mode) this code may need update
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*/
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void
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vshTablePrintToStdout(vshTable *table, vshControl *ctl)
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{
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bool header;
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g_autofree char *out = NULL;
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header = ctl ? !ctl->quiet : true;
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out = vshTablePrintToString(table, header);
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if (out)
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vshPrint(ctl, "%s", out);
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}
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/**
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* vshTablePrintToString:
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* @table: table to print
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* @header: whetever to print to header (true) or not (false)
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*
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* Return string containing table, or NULL if table was printed to
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* stdout. User will have to free returned string.
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*/
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char *
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vshTablePrintToString(vshTable *table, bool header)
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{
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return vshTablePrint(table, header);
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}
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