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Clean up psql variable code a little: eliminate unnecessary tests in

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GetVariable() and be consistent about treatment of the list header.
Motivated by noticing strspn() taking an unreasonable percentage of
runtime --- the call removed from GetVariable() was the only one that
could be in a high-usage path ...
This commit is contained in:
Tom Lane 2006-06-21 16:05:11 +00:00
parent 3f9aace723
commit 04c5b69603
1 changed files with 20 additions and 21 deletions
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41
src/bin/psql/variables.c
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@ -3,7 +3,7 @@
*
* Copyright (c) 2000-2006, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/bin/psql/variables.c,v 1.24 2006/06/14 16:49:03 tgl Exp $
* $PostgreSQL: pgsql/src/bin/psql/variables.c,v 1.25 2006/06/21 16:05:11 tgl Exp $
*/
#include "postgres_fe.h"
#include "common.h"
@ -29,15 +29,13 @@ GetVariable(VariableSpace space, const char *name)
if (!space)
return NULL;
if (strspn(name, VALID_VARIABLE_CHARS) != strlen(name))
return NULL;
for (current = space; current; current = current->next)
for (current = space->next; current; current = current->next)
{
psql_assert(current->name);
psql_assert(current->value);
if (strcmp(current->name, name) == 0)
{
psql_assert(current->value);
return current->value;
}
}
return NULL;
@ -126,6 +124,9 @@ PrintVariables(VariableSpace space)
{
struct _variable *ptr;
if (!space)
return;
for (ptr = space->next; ptr; ptr = ptr->next)
{
printf("%s = '%s'\n", ptr->name, ptr->value);
@ -143,18 +144,19 @@ SetVariable(VariableSpace space, const char *name, const char *value)
if (!space)
return false;
if (!value)
return DeleteVariable(space, name);
if (strspn(name, VALID_VARIABLE_CHARS) != strlen(name))
return false;
for (current = space, previous = NULL; current; previous = current, current = current->next)
if (!value)
return DeleteVariable(space, name);
for (previous = space, current = space->next;
current;
previous = current, current = current->next)
{
psql_assert(current->name);
psql_assert(current->value);
if (strcmp(current->name, name) == 0)
{
psql_assert(current->value);
free(current->value);
current->value = pg_strdup(value);
return true;
@ -182,19 +184,16 @@ DeleteVariable(VariableSpace space, const char *name)
if (!space)
return false;
if (strspn(name, VALID_VARIABLE_CHARS) != strlen(name))
return false;
for (current = space, previous = NULL; current; previous = current, current = current->next)
for (previous = space, current = space->next;
current;
previous = current, current = current->next)
{
psql_assert(current->name);
psql_assert(current->value);
if (strcmp(current->name, name) == 0)
{
psql_assert(current->value);
previous->next = current->next;
free(current->name);
free(current->value);
if (previous)
previous->next = current->next;
free(current);
return true;
}