It solves problems with alignment of columns. Width of each column is calculated by its biggest cell. Should solve unicode bug. In future, it may be implemented in virsh, virt-admin... This API has 5 public functions: - vshTableNew - adds new table and defines its header - vshTableRowAppend - appends new row (for same number of columns as in header) - vshTablePrintToStdout - vshTablePrintToString - vshTableFree https://bugzilla.redhat.com/show_bug.cgi?id=1574624 https://bugzilla.redhat.com/show_bug.cgi?id=1584630 Signed-off-by: Simon Kobyda <skobyda@xxxxxxxxxx> --- tools/Makefile.am | 4 +- tools/vsh-table.c | 449 ++++++++++++++++++++++++++++++++++++++++++++++ tools/vsh-table.h | 42 +++++ 3 files changed, 494 insertions(+), 1 deletion(-) create mode 100644 tools/vsh-table.c create mode 100644 tools/vsh-table.h diff --git a/tools/Makefile.am b/tools/Makefile.am index 1452d984a0..f069167acc 100644 --- a/tools/Makefile.am +++ b/tools/Makefile.am @@ -144,7 +144,9 @@ libvirt_shell_la_LIBADD = \ $(READLINE_LIBS) \ ../gnulib/lib/libgnu.la \ $(NULL) -libvirt_shell_la_SOURCES = vsh.c vsh.h +libvirt_shell_la_SOURCES = \ + vsh.c vsh.h \ + vsh-table.c vsh-table.h virt_host_validate_SOURCES = \ virt-host-validate.c \ diff --git a/tools/vsh-table.c b/tools/vsh-table.c new file mode 100644 index 0000000000..ca4e9265c5 --- /dev/null +++ b/tools/vsh-table.c @@ -0,0 +1,449 @@ +/* + * vsh-table.c: table printing helper + * + * Copyright (C) 2018 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 library. If not, see + * <http://www.gnu.org/licenses/>. + * + * Authors: + * Simon Kobyda <skobyda@xxxxxxxxxx> + * + */ + +#include <config.h> +#include "vsh-table.h" + +#include <string.h> +#include <stdarg.h> +#include <stddef.h> +#include <wchar.h> +#include <wctype.h> +#include "c-ctype.h" + +#include "viralloc.h" +#include "virbuffer.h" +#include "virstring.h" +#include "virsh-util.h" + +#define HEX_ENCODE_LENGTH 4 /* represents length of '\xNN' */ + +struct _vshTableRow { + char **cells; + size_t ncells; +}; + +struct _vshTable { + vshTableRowPtr *rows; + size_t nrows; +}; + +static void +vshTableRowFree(vshTableRowPtr row) +{ + size_t i; + + if (!row) + return; + + for (i = 0; i < row->ncells; i++) + VIR_FREE(row->cells[i]); + + VIR_FREE(row->cells); + VIR_FREE(row); +} + +void +vshTableFree(vshTablePtr table) +{ + size_t i; + + if (!table) + return; + + for (i = 0; i < table->nrows; i++) + vshTableRowFree(table->rows[i]); + VIR_FREE(table->rows); + VIR_FREE(table); +} + +/** + * vshTableRowNew: + * @arg: the first argument. + * @ap: list of variadic arguments + * + * Create a new row in the table. Each argument passed + * represents a cell in the row. + * + * Return: pointer to vshTableRowPtr row or NULL. + */ +static vshTableRowPtr +vshTableRowNew(const char *arg, va_list ap) +{ + vshTableRowPtr row = NULL; + + if (!arg) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Table row cannot be empty")); + goto error; + } + + if (VIR_ALLOC(row) < 0) + goto error; + + while (arg) { + char *tmp = NULL; + + if (VIR_STRDUP(tmp, arg) < 0) + goto error; + + if (VIR_APPEND_ELEMENT(row->cells, row->ncells, tmp) < 0) { + VIR_FREE(tmp); + goto error; + } + + arg = va_arg(ap, const char *); + } + + return row; + + error: + vshTableRowFree(row); + return NULL; +} + +/** + * vshTableNew: + * @arg: List of column names (NULL terminated) + * + * Create a new table. + * + * Returns: pointer to table or NULL. + */ +vshTablePtr +vshTableNew(const char *arg, ...) +{ + vshTablePtr table = NULL; + vshTableRowPtr header = NULL; + va_list ap; + + if (VIR_ALLOC(table) < 0) + goto error; + + va_start(ap, arg); + header = vshTableRowNew(arg, ap); + va_end(ap); + + if (!header) + goto error; + + if (VIR_APPEND_ELEMENT(table->rows, table->nrows, header) < 0) + goto error; + + return table; + error: + vshTableRowFree(header); + vshTableFree(table); + return NULL; +} + +/** + * vshTableRowAppend: + * @table: table to append to + * @arg: cells of the row (NULL terminated) + * + * Append new row into the @table. The number of cells in the row has + * to be equal to the number of cells in the table header. + * + * Returns: 0 if succeeded, -1 if failed. + */ +int +vshTableRowAppend(vshTablePtr table, const char *arg, ...) +{ + vshTableRowPtr row = NULL; + size_t ncolumns = table->rows[0]->ncells; + va_list ap; + int ret = -1; + + va_start(ap, arg); + row = vshTableRowNew(arg, ap); + va_end(ap); + + if (!row) + goto cleanup; + + if (ncolumns != row->ncells) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Incorrect number of cells in a table row")); + goto cleanup; + } + + if (VIR_APPEND_ELEMENT(table->rows, table->nrows, row) < 0) + goto cleanup; + + ret = 0; + cleanup: + vshTableRowFree(row); + return ret; +} + +/** + * Function pulled from util-linux + * + * Function's name in util-linux: mbs_safe_encode_to_buffer + * + * Returns allocated string where all control and non-printable chars are + * replaced with \x?? hex sequence, or NULL. + */ +static char * +vshTableSafeEncode(const char *s, size_t *width) +{ + const char *p = s; + size_t sz = s ? strlen(s) : 0; + char *buf; + char *ret; + mbstate_t st; + + memset(&st, 0, sizeof(st)); + + if (VIR_ALLOC_N(buf, (sz * HEX_ENCODE_LENGTH) + 1) < 0) + return NULL; + + if (!sz) + return NULL; + + ret = buf; + *width = 0; + + while (p && *p) { + if ((*p == '\\' && *(p + 1) == 'x') || + c_iscntrl(*p)) { + snprintf(buf, HEX_ENCODE_LENGTH + 1, "\\x%02x", *p); + buf += HEX_ENCODE_LENGTH; + *width += HEX_ENCODE_LENGTH; + p++; + } else { + wchar_t wc; + size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st); + + if (len == 0) + break; /* end of string */ + + if (len == (size_t) -1 || len == (size_t) -2) { + len = 1; + /* + * Not valid multibyte sequence -- maybe it's + * printable char according to the current locales. + */ + if (!c_isprint(*p)) { + snprintf(buf, HEX_ENCODE_LENGTH + 1, "\\x%02x", *p); + buf += HEX_ENCODE_LENGTH; + *width += HEX_ENCODE_LENGTH; + } else { + (*width)++; + *buf++ = *p; + } + } else if (!iswprint(wc)) { + size_t i; + for (i = 0; i < len; i++) { + snprintf(buf, HEX_ENCODE_LENGTH + 1, "\\x%02x", p[i]); + buf += HEX_ENCODE_LENGTH; + *width += HEX_ENCODE_LENGTH; + } + } else { + memcpy(buf, p, len); + buf += len; + *width += wcwidth(wc); + } + p += len; + } + } + + *buf = '\0'; + return ret; +} + +/** + * vshTableGetColumnsWidths: + * @table: table + * @maxwidths: maximum count of characters for each columns + * @widths: count of characters for each cell in the table + * + * Fill passed @maxwidths and @widths arrays with maximum number + * of characters for columns and number of character per each + * table cell, respectively. + * Handle unicode strings (user must have multibyte locale) + * + * Return 0 in case of success, -1 otherwise. + */ +static int +vshTableGetColumnsWidths(vshTablePtr table, + size_t *maxwidths, + size_t **widths, + bool header) +{ + size_t i; + size_t j; + + i = header? 0 : 1; + for (; i < table->nrows; i++) { + vshTableRowPtr row = table->rows[i]; + + for (j = 0; j < row->ncells; j++) { + size_t size = 0; + /* need to replace nonprintable and control characters, + * because width of some of those characters (e.g. \t, \v, \b ...) + * cannot be counted properly */ + char *tmp = vshTableSafeEncode(row->cells[j], &size); + if (!tmp) + return -1; + + VIR_FREE(row->cells[j]); + row->cells[j] = tmp; + widths[i][j] = size; + + if (widths[i][j] > maxwidths[j]) + maxwidths[j] = widths[i][j]; + } + } + + return 0; +} + +/** + * vshTableRowPrint: + * @row: table to append to + * @maxwidths: maximum count of characters for each columns + * @widths: count of character for each cell in this row + * @buf: buffer to store table (only if @toStdout == true) + */ +static void +vshTableRowPrint(vshTableRowPtr row, + size_t *maxwidths, + size_t *widths, + virBufferPtr buf) +{ + size_t i; + size_t j; + + for (i = 0; i < row->ncells; i++) { + virBufferAsprintf(buf, " %s", row->cells[i]); + + for (j = 0; j < maxwidths[i] - widths[i] + 2; j++) + virBufferAddChar(buf, ' '); + } + virBufferAddChar(buf, '\n'); +} + +/** + * vshTablePrint: + * @table: table to print + * @header: whetever to print to header (true) or not (false) + * this argument is relevant only if @ctl == NULL + * + * Get table. To get an alignment of columns right, function + * fills 2d array @widths with count of characters in each cell and + * array @maxwidths maximum count of character in each column. + * Function then prints tables header and content. + * + * Return string containing table, or NULL + */ +static char * +vshTablePrint(vshTablePtr table, bool header) +{ + size_t i; + size_t j; + size_t *maxwidths; + size_t **widths; + virBuffer buf = VIR_BUFFER_INITIALIZER; + char *ret = NULL; + + if (VIR_ALLOC_N(maxwidths, table->rows[0]->ncells)) + goto cleanup; + + if (VIR_ALLOC_N(widths, table->nrows)) + goto cleanup; + + /* retrieve widths of columns */ + for (i = 0; i < table->nrows; i++) { + if (VIR_ALLOC_N(widths[i], table->rows[0]->ncells)) + goto cleanup; + } + + if (vshTableGetColumnsWidths(table, maxwidths, widths, header) < 0) + goto cleanup; + + if (header) { + /* print header */ + vshTableRowPrint(table->rows[0], maxwidths, widths[0], &buf); + + /* print dividing line */ + for (i = 0; i < table->rows[0]->ncells; i++) { + for (j = 0; j < maxwidths[i] + 3; j++) + virBufferAddChar(&buf, '-'); + } + virBufferAddChar(&buf, '\n'); + } + /* print content */ + for (i = 1; i < table->nrows; i++) + vshTableRowPrint(table->rows[i], maxwidths, widths[i], &buf); + + ret = virBufferContentAndReset(&buf); + + cleanup: + VIR_FREE(maxwidths); + for (i = 0; i < table->nrows; i++) + VIR_FREE(widths[i]); + VIR_FREE(widths); + return ret; +} + + +/** + * vshTablePrintToStdout: + * @table: table to print + * @ctl virtshell control structure + * + * Print table returned in string to stdout. + * If effect on vshControl structure on priting function changes in future + * (apart from quiet mode) this code may need update + */ +void +vshTablePrintToStdout(vshTablePtr table, vshControl *ctl) +{ + bool header; + char *out; + + header = ctl ? !ctl->quiet : true; + + out = vshTablePrintToString(table, header); + if (out) + vshPrint(ctl, "%s", out); + + VIR_FREE(out); +} + +/** + * vshTablePrintToString: + * @table: table to print + * @header: whetever to print to header (true) or not (false) + * + * Return string containing table, or NULL if table was printed to + * stdout. User will have to free returned string. + */ +char * +vshTablePrintToString(vshTablePtr table, bool header) +{ + return vshTablePrint(table, header); +} diff --git a/tools/vsh-table.h b/tools/vsh-table.h new file mode 100644 index 0000000000..e4e9582b9f --- /dev/null +++ b/tools/vsh-table.h @@ -0,0 +1,42 @@ +/* + * vsh-table.h: table printing helper + * + * Copyright (C) 2018 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 library. If not, see + * <http://www.gnu.org/licenses/>. + * + * Authors: + * Simon Kobyda <skobyda@xxxxxxxxxx> + * + */ + +#ifndef VSH_TABLE_H +# define VSH_TABLE_H + +# include "vsh.h" + +/* forward declarations */ +typedef struct _vshTable vshTable; +typedef struct _vshTableRow vshTableRow; +typedef vshTable *vshTablePtr; +typedef vshTableRow *vshTableRowPtr; + +void vshTableFree(vshTablePtr table); +vshTablePtr vshTableNew(const char *format, ...); +int vshTableRowAppend(vshTablePtr table, const char *arg, ...); +void vshTablePrintToStdout(vshTablePtr table, vshControl *ctl); +char *vshTablePrintToString(vshTablePtr table, bool header); + +#endif /* VSH_TABLE_H */ -- 2.17.1 -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list
