From 596c9e9efdbef0b0a597f3c8df478e51a50729e3 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Thu, 24 Sep 2015 23:01:04 -0400
Subject: [PATCH] Fix psql's code for locale-aware formatting of numeric
output.
This code did the wrong thing entirely for numbers with an exponent
but no decimal point (e.g., '1e6'), as reported by Jeff Janes in
bug #13636. More generally, it made lots of unverified assumptions
about what the input string could possibly look like. Rearrange so
that it only fools with leading digits that it's directly verified
are there, and an immediately adjacent decimal point. While at it,
get rid of some useless inefficiencies, like converting the grouping
count string to integer over and over (and over).
This has been broken for a long time, so back-patch to all supported
branches.
---
src/bin/psql/print.c | 103 +++++++++++++++++++------------------------
1 file changed, 45 insertions(+), 58 deletions(-)
diff --git a/src/bin/psql/print.c b/src/bin/psql/print.c
index 603019b7dd2..1e6f254c2ca 100644
--- a/src/bin/psql/print.c
+++ b/src/bin/psql/print.c
@@ -40,8 +40,9 @@
*/
volatile bool cancel_pressed = false;
+/* info for locale-aware numeric formatting; set up by setDecimalLocale() */
static char *decimal_point;
-static char *grouping;
+static int groupdigits;
static char *thousands_sep;
static char default_footer[100];
@@ -162,44 +163,35 @@ pg_local_calloc(int count, size_t size)
return tmp;
}
+/* Count number of digits in integral part of number */
static int
integer_digits(const char *my_str)
{
- int frac_len;
-
- if (my_str[0] == '-')
+ /* ignoring any sign ... */
+ if (my_str[0] == '-' || my_str[0] == '+')
my_str++;
-
- frac_len = strchr(my_str, '.') ? strlen(strchr(my_str, '.')) : 0;
-
- return strlen(my_str) - frac_len;
+ /* ... count initial integral digits */
+ return strspn(my_str, "0123456789");
}
-/* Return additional length required for locale-aware numeric output */
+/* Compute additional length required for locale-aware numeric output */
static int
additional_numeric_locale_len(const char *my_str)
{
int int_len = integer_digits(my_str),
len = 0;
- int groupdigits = atoi(grouping);
- if (int_len > 0)
- /* Don't count a leading separator */
- len = (int_len / groupdigits - (int_len % groupdigits == 0)) *
- strlen(thousands_sep);
+ /* Account for added thousands_sep instances */
+ if (int_len > groupdigits)
+ len += ((int_len - 1) / groupdigits) * strlen(thousands_sep);
+ /* Account for possible additional length of decimal_point */
if (strchr(my_str, '.') != NULL)
- len += strlen(decimal_point) - strlen(".");
+ len += strlen(decimal_point) - 1;
return len;
}
-static int
-strlen_with_numeric_locale(const char *my_str)
-{
- return strlen(my_str) + additional_numeric_locale_len(my_str);
-}
-
/*
* Returns the appropriately formatted string in a new allocated block,
* caller must free
@@ -207,55 +199,49 @@ strlen_with_numeric_locale(const char *my_str)
static char *
format_numeric_locale(const char *my_str)
{
+ int new_len = strlen(my_str) + additional_numeric_locale_len(my_str);
+ char *new_str = pg_local_malloc(new_len + 1);
+ int int_len = integer_digits(my_str);
int i,
- j,
- int_len = integer_digits(my_str),
leading_digits;
- int groupdigits = atoi(grouping);
- int new_str_start = 0;
- char *new_str = pg_local_malloc(
- strlen_with_numeric_locale(my_str) + 1);
+ int new_str_pos = 0;
- leading_digits = (int_len % groupdigits != 0) ?
- int_len % groupdigits : groupdigits;
+ /* number of digits in first thousands group */
+ leading_digits = int_len % groupdigits;
+ if (leading_digits == 0)
+ leading_digits = groupdigits;
- if (my_str[0] == '-') /* skip over sign, affects grouping
- * calculations */
+ /* process sign */
+ if (my_str[0] == '-' || my_str[0] == '+')
{
- new_str[0] = my_str[0];
+ new_str[new_str_pos++] = my_str[0];
my_str++;
- new_str_start = 1;
}
- for (i = 0, j = new_str_start;; i++, j++)
+ /* process integer part of number */
+ for (i = 0; i < int_len; i++)
{
- /* Hit decimal point? */
- if (my_str[i] == '.')
+ /* Time to insert separator? */
+ if (i > 0 && --leading_digits == 0)
{
- strcpy(&new_str[j], decimal_point);
- j += strlen(decimal_point);
- /* add fractional part */
- strcpy(&new_str[j], &my_str[i] + 1);
- break;
- }
-
- /* End of string? */
- if (my_str[i] == '\0')
- {
- new_str[j] = '\0';
- break;
- }
-
- /* Add separator? */
- if (i != 0 && (i - leading_digits) % groupdigits == 0)
- {
- strcpy(&new_str[j], thousands_sep);
- j += strlen(thousands_sep);
+ strcpy(&new_str[new_str_pos], thousands_sep);
+ new_str_pos += strlen(thousands_sep);
+ leading_digits = groupdigits;
}
+ new_str[new_str_pos++] = my_str[i];
+ }
- new_str[j] = my_str[i];
+ /* handle decimal point if any */
+ if (my_str[i] == '.')
+ {
+ strcpy(&new_str[new_str_pos], decimal_point);
+ new_str_pos += strlen(decimal_point);
+ i++;
}
+ /* copy the rest (fractional digits and/or exponent, and \0 terminator) */
+ strcpy(&new_str[new_str_pos], &my_str[i]);
+
return new_str;
}
@@ -2542,10 +2528,11 @@ setDecimalLocale(void)
decimal_point = pg_strdup(extlconv->decimal_point);
else
decimal_point = "."; /* SQL output standard */
+
if (*extlconv->grouping && atoi(extlconv->grouping) > 0)
- grouping = pg_strdup(extlconv->grouping);
+ groupdigits = atoi(extlconv->grouping);
else
- grouping = "3"; /* most common */
+ groupdigits = 3; /* most common */
/* similar code exists in formatting.c */
if (*extlconv->thousands_sep)
--
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