*
* Copyright (c) 2000-2008, PostgreSQL Global Development Group
*
- * $PostgreSQL: pgsql/src/bin/psql/print.c,v 1.97 2008/03/27 03:57:34 tgl Exp $
+ * $PostgreSQL: pgsql/src/bin/psql/print.c,v 1.98 2008/05/08 17:04:26 momjian Exp $
*/
#include "postgres_fe.h"
#include "mbprint.h"
+static int strlen_max_width(unsigned char *str, int *target_width, int encoding);
+
/*
* We define the cancel_pressed flag in this file, rather than common.c where
* it naturally belongs, because this file is also used by non-psql programs
static char *grouping;
static char *thousands_sep;
+
static void *
pg_local_malloc(size_t size)
{
}
+/*
+ * Prety pretty boxes around cells.
+ */
static void
print_aligned_text(const char *title, const char *const * headers,
const char *const * cells, const char *const * footers,
const char *opt_align, const printTableOpt *opt,
- FILE *fout)
+ bool is_pager, FILE *fout)
{
bool opt_tuples_only = opt->tuples_only;
bool opt_numeric_locale = opt->numericLocale;
- unsigned short int opt_border = opt->border;
int encoding = opt->encoding;
- unsigned int col_count = 0;
- unsigned int cell_count = 0;
- unsigned int i;
- int tmp;
- unsigned int *widths,
- total_w;
- unsigned int *heights;
- unsigned int *format_space;
+ unsigned short int opt_border = opt->border;
+
+ unsigned int col_count = 0, cell_count = 0;
+
+ unsigned int i,
+ j;
+
+ unsigned int *width_header,
+ *max_width,
+ *width_wrap,
+ *width_average;
+ unsigned int *max_nl_lines, /* value split by newlines */
+ *curr_nl_line,
+ *max_bytes;
unsigned char **format_buf;
+ unsigned int width_total;
+ unsigned int total_header_width;
- const char *const * ptr;
+ const char * const *ptr;
- struct lineptr **col_lineptrs; /* pointers to line pointer for each
- * column */
- struct lineptr *lineptr_list; /* complete list of linepointers */
+ struct lineptr **col_lineptrs; /* pointers to line pointer per column */
- int *complete; /* Array remembering which columns have
- * completed output */
+ bool *header_done; /* Have all header lines been output? */
+ int *bytes_output; /* Bytes output for column value */
+ int output_columns = 0; /* Width of interactive console */
if (cancel_pressed)
return;
if (col_count > 0)
{
- widths = pg_local_calloc(col_count, sizeof(*widths));
- heights = pg_local_calloc(col_count, sizeof(*heights));
+ width_header = pg_local_calloc(col_count, sizeof(*width_header));
+ width_average = pg_local_calloc(col_count, sizeof(*width_average));
+ max_width = pg_local_calloc(col_count, sizeof(*max_width));
+ width_wrap = pg_local_calloc(col_count, sizeof(*width_wrap));
+ max_nl_lines = pg_local_calloc(col_count, sizeof(*max_nl_lines));
+ curr_nl_line = pg_local_calloc(col_count, sizeof(*curr_nl_line));
col_lineptrs = pg_local_calloc(col_count, sizeof(*col_lineptrs));
- format_space = pg_local_calloc(col_count, sizeof(*format_space));
+ max_bytes = pg_local_calloc(col_count, sizeof(*max_bytes));
format_buf = pg_local_calloc(col_count, sizeof(*format_buf));
- complete = pg_local_calloc(col_count, sizeof(*complete));
+ header_done = pg_local_calloc(col_count, sizeof(*header_done));
+ bytes_output = pg_local_calloc(col_count, sizeof(*bytes_output));
}
else
{
- widths = NULL;
- heights = NULL;
+ width_header = NULL;
+ width_average = NULL;
+ max_width = NULL;
+ width_wrap = NULL;
+ max_nl_lines = NULL;
+ curr_nl_line = NULL;
col_lineptrs = NULL;
- format_space = NULL;
+ max_bytes = NULL;
format_buf = NULL;
- complete = NULL;
+ header_done = NULL;
+ bytes_output = NULL;
}
- /* count cells (rows * cols) */
- for (ptr = cells; *ptr; ptr++)
- cell_count++;
-
- /* calc column widths */
+ /* scan all column headers, find maximum width and max max_nl_lines */
for (i = 0; i < col_count; i++)
{
- /* Get width & height */
- int height,
- space;
-
- pg_wcssize((unsigned char *) headers[i], strlen(headers[i]), encoding, &tmp, &height, &space);
- if (tmp > widths[i])
- widths[i] = tmp;
- if (height > heights[i])
- heights[i] = height;
- if (space > format_space[i])
- format_space[i] = space;
+ int width,
+ nl_lines,
+ bytes_required;
+
+ pg_wcssize((unsigned char *) headers[i], strlen(headers[i]), encoding, &width, &nl_lines, &bytes_required);
+ if (width > max_width[i])
+ max_width[i] = width;
+ if (nl_lines > max_nl_lines[i])
+ max_nl_lines[i] = nl_lines;
+ if (bytes_required > max_bytes[i])
+ max_bytes[i] = bytes_required;
+
+ width_header[i] = width;
}
- for (i = 0, ptr = cells; *ptr; ptr++, i++)
+ /* scan all cells, find maximum width, compute cell_count */
+ for (i = 0, ptr = cells; *ptr; ptr++, i++, cell_count++)
{
- int numeric_locale_len;
- int height,
- space;
+ int width,
+ nl_lines,
+ bytes_required;
- if (opt_align[i % col_count] == 'r' && opt_numeric_locale)
- numeric_locale_len = additional_numeric_locale_len(*ptr);
- else
- numeric_locale_len = 0;
+ /* Get width, ignore nl_lines */
+ pg_wcssize((unsigned char *) *ptr, strlen(*ptr), encoding, &width, &nl_lines, &bytes_required);
+ if (opt_numeric_locale && opt_align[i % col_count] == 'r')
+ {
+ width += additional_numeric_locale_len(*ptr);
+ bytes_required += additional_numeric_locale_len(*ptr);
+ }
+
+ if (width > max_width[i % col_count])
+ max_width[i % col_count] = width;
+ if (nl_lines > max_nl_lines[i % col_count])
+ max_nl_lines[i % col_count] = nl_lines;
+ if (bytes_required > max_bytes[i % col_count])
+ max_bytes[i % col_count] = bytes_required;
- /* Get width, ignore height */
- pg_wcssize((unsigned char *) *ptr, strlen(*ptr), encoding, &tmp, &height, &space);
- tmp += numeric_locale_len;
- if (tmp > widths[i % col_count])
- widths[i % col_count] = tmp;
- if (height > heights[i % col_count])
- heights[i % col_count] = height;
- if (space > format_space[i % col_count])
- format_space[i % col_count] = space;
+ width_average[i % col_count] += width;
}
+ /* If we have rows, compute average */
+ if (col_count != 0 && cell_count != 0)
+ {
+ int rows = cell_count / col_count;
+
+ for (i = 0; i < col_count; i++)
+ width_average[i % col_count] /= rows;
+ }
+
+ /* adjust the total display width based on border style */
if (opt_border == 0)
- total_w = col_count - 1;
+ width_total = col_count - 1;
else if (opt_border == 1)
- total_w = col_count * 3 - 1;
+ width_total = col_count * 3 - 1;
else
- total_w = col_count * 3 + 1;
+ width_total = col_count * 3 + 1;
+ total_header_width = width_total;
for (i = 0; i < col_count; i++)
- total_w += widths[i];
+ {
+ width_total += max_width[i];
+ total_header_width += width_header[i];
+ }
/*
- * At this point: widths contains the max width of each column heights
- * contains the max height of a cell of each column format_space contains
- * maximum space required to store formatted string so we prepare the
- * formatting structures
+ * At this point: max_width[] contains the max width of each column,
+ * max_nl_lines[] contains the max number of lines in each column,
+ * max_bytes[] contains the maximum storage space for formatting
+ * strings, width_total contains the giant width sum. Now we allocate
+ * some memory for line pointers.
*/
- if (col_count > 0)
+ for (i = 0; i < col_count; i++)
{
- int heights_total = 0;
- struct lineptr *lineptr;
+ /* Add entry for ptr == NULL array termination */
+ col_lineptrs[i] = pg_local_calloc(max_nl_lines[i] + 1,
+ sizeof(**col_lineptrs));
- for (i = 0; i < col_count; i++)
- heights_total += heights[i];
+ format_buf[i] = pg_local_malloc(max_bytes[i] + 1);
- lineptr = lineptr_list = pg_local_calloc(heights_total, sizeof(*lineptr_list));
+ col_lineptrs[i]->ptr = format_buf[i];
+ }
- for (i = 0; i < col_count; i++)
+ /* Default word wrap to the full width, i.e. no word wrap */
+ for (i = 0; i < col_count; i++)
+ width_wrap[i] = max_width[i];
+
+ if (opt->format == PRINT_WRAPPED)
+ {
+ /* Get terminal width */
+ if (opt->columns > 0)
+ output_columns = opt->columns;
+ else if ((fout == stdout && isatty(fileno(stdout))) || is_pager)
{
- col_lineptrs[i] = lineptr;
- lineptr += heights[i];
+ if (opt->env_columns)
+ output_columns = opt->env_columns;
+#ifdef TIOCGWINSZ
+ else
+ {
+ struct winsize screen_size;
+
+ if (ioctl(fileno(stdout), TIOCGWINSZ, &screen_size) != -1)
+ output_columns = screen_size.ws_col;
+ }
+#endif
+ }
+
+ /*
+ * Optional optimized word wrap. Shrink columns with a high max/avg ratio.
+ * Slighly bias against wider columns. (Increases chance a narrow column
+ * will fit in its cell.)
+ * If available columns is positive...
+ * and greater than the width of the unshrinkable column headers
+ */
+ if (output_columns > 0 && output_columns >= total_header_width)
+ {
+ /* While there is still excess width... */
+ while (width_total > output_columns)
+ {
+ double max_ratio = 0;
+ int worst_col = -1;
+
+ /*
+ * Find column that has the highest ratio of its maximum
+ * width compared to its average width. This tells us which
+ * column will produce the fewest wrapped values if shortened.
+ * width_wrap starts as equal to max_width.
+ */
+ for (i = 0; i < col_count; i++)
+ {
+ if (width_average[i] && width_wrap[i] > width_header[i])
+ {
+ /* Penalize wide columns by +1% of their width (0.01) */
+ double ratio = (double)width_wrap[i] / width_average[i] +
+ max_width[i] * 0.01;
- format_buf[i] = pg_local_malloc(format_space[i]);
+ if (ratio > max_ratio)
+ {
+ max_ratio = ratio;
+ worst_col = i;
+ }
+ }
+ }
+
+ /* Exit loop if we can't squeeze any more. */
+ if (worst_col == -1)
+ break;
- col_lineptrs[i]->ptr = format_buf[i];
+ /* Decrease width of target column by one. */
+ width_wrap[worst_col]--;
+ width_total--;
+ }
}
}
- else
- lineptr_list = NULL;
+ /* time to output */
if (opt->start_table)
{
/* print title */
if (title && !opt_tuples_only)
{
- /* Get width & height */
- int height;
+ int width, height;
- pg_wcssize((unsigned char *) title, strlen(title), encoding, &tmp, &height, NULL);
- if (tmp >= total_w)
- fprintf(fout, "%s\n", title);
+ pg_wcssize((unsigned char *) title, strlen(title), encoding, &width, &height, NULL);
+ if (width >= width_total)
+ fprintf(fout, "%s\n", title); /* Aligned */
else
- fprintf(fout, "%-*s%s\n", (total_w - tmp) / 2, "", title);
+ fprintf(fout, "%-*s%s\n", (width_total - width) / 2, "", title); /* Centered */
}
/* print headers */
if (!opt_tuples_only)
{
- int cols_todo;
- int line_count;
+ int more_col_wrapping;
+ int curr_nl_line;
if (opt_border == 2)
- _print_horizontal_line(col_count, widths, opt_border, fout);
+ _print_horizontal_line(col_count, width_wrap, opt_border, fout);
for (i = 0; i < col_count; i++)
- pg_wcsformat((unsigned char *) headers[i], strlen(headers[i]), encoding, col_lineptrs[i], heights[i]);
+ pg_wcsformat((unsigned char *) headers[i], strlen(headers[i]),
+ encoding, col_lineptrs[i], max_nl_lines[i]);
- cols_todo = col_count;
- line_count = 0;
- memset(complete, 0, col_count * sizeof(int));
- while (cols_todo)
+ more_col_wrapping = col_count;
+ curr_nl_line = 0;
+ memset(header_done, false, col_count * sizeof(bool));
+ while (more_col_wrapping)
{
if (opt_border == 2)
- fprintf(fout, "|%c", line_count ? '+' : ' ');
+ fprintf(fout, "|%c", curr_nl_line ? '+' : ' ');
else if (opt_border == 1)
- fputc(line_count ? '+' : ' ', fout);
+ fputc(curr_nl_line ? '+' : ' ', fout);
for (i = 0; i < col_count; i++)
{
unsigned int nbspace;
- struct lineptr *this_line = col_lineptrs[i] + line_count;
+ struct lineptr *this_line = col_lineptrs[i] + curr_nl_line;
- if (!complete[i])
+ if (!header_done[i])
{
- nbspace = widths[i] - this_line->width;
+ nbspace = width_wrap[i] - this_line->width;
/* centered */
fprintf(fout, "%-*s%s%-*s",
nbspace / 2, "", this_line->ptr, (nbspace + 1) / 2, "");
- if (line_count == (heights[i] - 1) || !(this_line + 1)->ptr)
+ if (!(this_line + 1)->ptr)
{
- cols_todo--;
- complete[i] = 1;
+ more_col_wrapping--;
+ header_done[i] = 1;
}
}
else
- fprintf(fout, "%*s", widths[i], "");
+ fprintf(fout, "%*s", width_wrap[i], "");
if (i < col_count - 1)
{
if (opt_border == 0)
- fputc(line_count ? '+' : ' ', fout);
+ fputc(curr_nl_line ? '+' : ' ', fout);
else
- fprintf(fout, " |%c", line_count ? '+' : ' ');
+ fprintf(fout, " |%c", curr_nl_line ? '+' : ' ');
}
}
- line_count++;
+ curr_nl_line++;
if (opt_border == 2)
fputs(" |", fout);
else if (opt_border == 1)
- fputc(' ', fout);;
+ fputc(' ', fout);
fputc('\n', fout);
}
- _print_horizontal_line(col_count, widths, opt_border, fout);
+ _print_horizontal_line(col_count, width_wrap, opt_border, fout);
}
}
- /* print cells */
+ /* print cells, one loop per row */
for (i = 0, ptr = cells; *ptr; i += col_count, ptr += col_count)
{
- int j;
- int cols_todo = col_count;
- int line_count; /* Number of lines output so far in row */
+ bool more_lines;
if (cancel_pressed)
break;
+ /*
+ * Format each cell. Format again, it is a numeric formatting locale
+ * (e.g. 123,456 vs. 123456)
+ */
for (j = 0; j < col_count; j++)
- pg_wcsformat((unsigned char *) ptr[j], strlen(ptr[j]), encoding, col_lineptrs[j], heights[j]);
+ {
+ pg_wcsformat((unsigned char *) ptr[j], strlen(ptr[j]), encoding, col_lineptrs[j], max_nl_lines[j]);
+ curr_nl_line[j] = 0;
- line_count = 0;
- memset(complete, 0, col_count * sizeof(int));
- while (cols_todo)
+ if (opt_numeric_locale && opt_align[j % col_count] == 'r')
+ {
+ char *my_cell;
+
+ my_cell = format_numeric_locale((char *) col_lineptrs[j]->ptr);
+ strcpy((char *) col_lineptrs[j]->ptr, my_cell); /* Buffer IS large
+ * enough... now */
+ free(my_cell);
+ }
+ }
+
+ memset(bytes_output, 0, col_count * sizeof(int));
+
+ /*
+ * Each time through this loop, one display line is output.
+ * It can either be a full value or a partial value if embedded
+ * newlines exist or if 'format=wrapping' mode is enabled.
+ */
+ do
{
- /* beginning of line */
+ more_lines = false;
+
+ /* left border */
if (opt_border == 2)
fputs("| ", fout);
else if (opt_border == 1)
fputc(' ', fout);
+ /* for each column */
for (j = 0; j < col_count; j++)
{
- struct lineptr *this_line = col_lineptrs[j] + line_count;
- bool finalspaces = (opt_border == 2 || j != col_count - 1);
+ /* We have a valid array element, so index it */
+ struct lineptr *this_line = &col_lineptrs[j][curr_nl_line[j]];
+ int bytes_to_output, chars_to_output = width_wrap[j];
- if (complete[j]) /* Just print spaces... */
- {
- if (finalspaces)
- fprintf(fout, "%*s", widths[j], "");
- }
+ /* Past newline lines so pad for other columns */
+ if (!this_line->ptr)
+ fprintf(fout, "%*s", width_wrap[j], "");
else
{
- /* content */
- if (opt_align[j] == 'r')
+ /* Get strlen() of the width_wrap character */
+ bytes_to_output = strlen_max_width(this_line->ptr +
+ bytes_output[j], &chars_to_output, encoding);
+
+ /*
+ * If we exceeded width_wrap, it means the display width
+ * of a single character was wider than our target width.
+ * In that case, we have to pretend we are only printing
+ * the target display width and make the best of it.
+ */
+ if (chars_to_output > width_wrap[j])
+ chars_to_output = width_wrap[j];
+
+ if (opt_align[j] == 'r') /* Right aligned cell */
{
- if (opt_numeric_locale)
- {
- /*
- * Assumption: This code used only on strings
- * without multibyte characters, otherwise
- * this_line->width < strlen(this_ptr) and we get
- * an overflow
- */
- char *my_cell = format_numeric_locale((char *) this_line->ptr);
-
- fprintf(fout, "%*s%s",
- (int) (widths[i % col_count] - strlen(my_cell)), "",
- my_cell);
- free(my_cell);
- }
- else
- fprintf(fout, "%*s%s",
- widths[j] - this_line->width, "",
- this_line->ptr);
+ /* spaces first */
+ fprintf(fout, "%*s", width_wrap[j] - chars_to_output, "");
+ fprintf(fout, "%.*s", bytes_to_output,
+ this_line->ptr + bytes_output[j]);
}
+ else /* Left aligned cell */
+ {
+ /* spaces second */
+ fprintf(fout, "%.*s", bytes_to_output,
+ this_line->ptr + bytes_output[j]);
+ fprintf(fout, "%*s", width_wrap[j] - chars_to_output, "");
+ }
+
+ bytes_output[j] += bytes_to_output;
+
+ /* Do we have more text to wrap? */
+ if (*(this_line->ptr + bytes_output[j]) != 0)
+ more_lines = true;
else
- fprintf(fout, "%-s%*s", this_line->ptr,
- finalspaces ? (widths[j] - this_line->width) : 0, "");
- /* If at the right height, done this col */
- if (line_count == heights[j] - 1 || !this_line[1].ptr)
{
- complete[j] = 1;
- cols_todo--;
+ /* Advance to next newline line */
+ curr_nl_line[j]++;
+ if (col_lineptrs[j][curr_nl_line[j]].ptr != NULL)
+ more_lines = true;
+ bytes_output[j] = 0;
}
}
- /* divider */
+ /* print a divider, middle columns only */
if ((j + 1) % col_count)
{
if (opt_border == 0)
fputc(' ', fout);
- else if (line_count == 0)
- fputs(" | ", fout);
+ /* Next value is beyond past newlines? */
+ else if (col_lineptrs[j+1][curr_nl_line[j+1]].ptr == NULL)
+ fputs(" ", fout);
+ /* In wrapping of value? */
+ else if (bytes_output[j+1] != 0)
+ fputs(" ; ", fout);
+ /* After first newline value */
+ else if (curr_nl_line[j+1] != 0)
+ fputs(" : ", fout);
else
- fprintf(fout, " %c ", complete[j + 1] ? ' ' : ':');
+ /* Ordinary line */
+ fputs(" | ", fout);
}
+
}
+
+ /* end of row border */
if (opt_border == 2)
fputs(" |", fout);
fputc('\n', fout);
- line_count++;
- }
+
+ } while (more_lines);
}
if (opt->stop_table)
{
if (opt_border == 2 && !cancel_pressed)
- _print_horizontal_line(col_count, widths, opt_border, fout);
+ _print_horizontal_line(col_count, width_wrap, opt_border, fout);
/* print footers */
if (footers && !opt_tuples_only && !cancel_pressed)
}
/* clean up */
- free(widths);
- free(heights);
+ free(width_header);
+ free(width_average);
+ free(max_width);
+ free(width_wrap);
+ free(max_nl_lines);
+ free(curr_nl_line);
free(col_lineptrs);
- free(format_space);
- free(complete);
- free(lineptr_list);
+ free(max_bytes);
+ free(header_done);
+ free(bytes_output);
for (i = 0; i < col_count; i++)
free(format_buf[i]);
free(format_buf);
dheight = 1,
hformatsize = 0,
dformatsize = 0;
- int tmp = 0;
char *divider;
unsigned int cell_count = 0;
struct lineptr *hlineptr,
/* Find the maximum dimensions for the headers */
for (i = 0; i < col_count; i++)
{
- int height,
+ int width,
+ height,
fs;
- pg_wcssize((unsigned char *) headers[i], strlen(headers[i]), encoding, &tmp, &height, &fs);
- if (tmp > hwidth)
- hwidth = tmp;
+ pg_wcssize((unsigned char *) headers[i], strlen(headers[i]), encoding, &width, &height, &fs);
+ if (width > hwidth)
+ hwidth = width;
if (height > hheight)
hheight = height;
if (fs > hformatsize)
for (i = 0, ptr = cells; *ptr; ptr++, i++)
{
int numeric_locale_len;
- int height,
+ int width,
+ height,
fs;
if (opt_align[i % col_count] == 'r' && opt_numeric_locale)
else
numeric_locale_len = 0;
- pg_wcssize((unsigned char *) *ptr, strlen(*ptr), encoding, &tmp, &height, &fs);
- tmp += numeric_locale_len;
- if (tmp > dwidth)
- dwidth = tmp;
+ pg_wcssize((unsigned char *) *ptr, strlen(*ptr), encoding, &width, &height, &fs);
+ width += numeric_locale_len;
+ if (width > dwidth)
+ dwidth = width;
if (height > dheight)
dheight = height;
if (fs > dformatsize)
* We now have all the information we need to setup the formatting
* structures
*/
- dlineptr = pg_local_malloc(sizeof(*dlineptr) * dheight);
- hlineptr = pg_local_malloc(sizeof(*hlineptr) * hheight);
+ dlineptr = pg_local_malloc((sizeof(*dlineptr) + 1) * dheight);
+ hlineptr = pg_local_malloc((sizeof(*hlineptr) + 1) * hheight);
dlineptr->ptr = pg_local_malloc(dformatsize);
hlineptr->ptr = pg_local_malloc(hformatsize);
fprintf(fout, "%-s%*s", hlineptr[line_count].ptr,
hwidth - hlineptr[line_count].width, "");
- if (line_count == (hheight - 1) || !hlineptr[line_count + 1].ptr)
+ if (!hlineptr[line_count + 1].ptr)
hcomplete = 1;
}
else
dwidth - dlineptr[line_count].width, "");
}
- if (line_count == dheight - 1 || !dlineptr[line_count + 1].ptr)
+ if (!dlineptr[line_count + 1].ptr)
dcomplete = 1;
}
else
{
static const char *default_footer[] = {NULL};
FILE *output;
-
+ bool is_pager = false;
+
if (cancel_pressed)
return;
for (ptr = footers; *ptr; ptr++)
lines++;
output = PageOutput(lines, opt->pager);
+ is_pager = (output != fout);
}
else
output = fout;
if (flog)
print_aligned_text(title, headers, cells, footers, align,
- opt, flog);
+ opt, is_pager, flog);
switch (opt->format)
{
opt, output);
break;
case PRINT_ALIGNED:
+ case PRINT_WRAPPED:
if (opt->expanded)
print_aligned_vertical(title, headers, cells, footers, align,
opt, output);
else
print_aligned_text(title, headers, cells, footers, align,
- opt, output);
+ opt, is_pager, output);
break;
case PRINT_HTML:
if (opt->expanded)
exit(EXIT_FAILURE);
}
- /* Only close if we used the pager */
- if (output != fout)
+ if (is_pager)
ClosePager(output);
}
else
thousands_sep = ".";
}
+
+/*
+ * Returns the byte length to the end of the specified character
+ * and number of display characters processed (useful if the string
+ * is shorter then dpylen).
+ */
+static int
+strlen_max_width(unsigned char *str, int *target_width, int encoding)
+{
+ unsigned char *start = str;
+ int curr_width = 0;
+
+ while (*str && curr_width < *target_width)
+ {
+ int char_width = PQdsplen((char *) str, encoding);
+
+ /*
+ * If the display width of the new character causes
+ * the string to exceed its target width, skip it
+ * and return. However, if this is the first character
+ * of the string (*width == 0), we have to accept it.
+ */
+ if (*target_width - curr_width < char_width && curr_width != 0)
+ break;
+
+ str += PQmblen((char *)str, encoding);
+
+ curr_width += char_width;
+ }
+
+ *target_width = curr_width;
+
+ /* last byte */
+ return str - start;
+}
projects / postgresql / commitdiff