Hi,
On Fri, Jul 11, 2014 at 3:13 PM, Sawada Masahiko <sawada.m...@gmail.com>
wrote:
> >
> >
>
> To my understating cleanly, you means that line number is not changed
> when newline has reached to INT_MAX, is incorrect?
>
As per my thinking yes.
> And the line number should be switched to 1 when line number has
> reached to INT_MAX?
>
Yes, when it goes beyond INT_MAX, wrap around to 1.
BTW, I wonder, can't we simply use unsigned int instead?
Also, what is the behaviour on LINE n, in error message in case of such
wrap-around?
>
> >
> > Or much better, simply get rid of newline, and use cur_line itself, will
> > this work well for you?
>
> this is better. I will change code to this.
> Thanks.
> I will fix it.
>
Meanwhile I have tried this. Attached patch to have your suggestion on
that.
Thanks
--
Jeevan B Chalke
Principal Software Engineer, Product Development
EnterpriseDB Corporation
The Enterprise PostgreSQL Company
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 255e8ca..030f4d0 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -3298,6 +3298,11 @@ testdb=> <userinput>INSERT INTO my_table VALUES (:'content');</userinput>
</varlistentry>
<varlistentry>
+ <term><literal>%l</literal></term>
+ <listitem><para>The current line number</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><literal>%</literal><replaceable class="parameter">digits</replaceable></term>
<listitem>
<para>
diff --git a/src/bin/psql/mainloop.c b/src/bin/psql/mainloop.c
index c3aff20..675b550 100644
--- a/src/bin/psql/mainloop.c
+++ b/src/bin/psql/mainloop.c
@@ -8,6 +8,7 @@
#include "postgres_fe.h"
#include "mainloop.h"
+#include <limits.h>
#include "command.h"
#include "common.h"
@@ -58,6 +59,7 @@ MainLoop(FILE *source)
pset.cur_cmd_source = source;
pset.cur_cmd_interactive = ((source == stdin) && !pset.notty);
pset.lineno = 0;
+ cur_line = 1;
/* Create working state */
scan_state = psql_scan_create();
@@ -225,6 +227,7 @@ MainLoop(FILE *source)
{
PsqlScanResult scan_result;
promptStatus_t prompt_tmp = prompt_status;
+ char *tmp = line;
scan_result = psql_scan(scan_state, query_buf, &prompt_tmp);
prompt_status = prompt_tmp;
@@ -235,6 +238,30 @@ MainLoop(FILE *source)
exit(EXIT_FAILURE);
}
+ /*
+ * Increase current line number counter with the new lines present
+ * in the line buffer
+ */
+ while (*tmp != '\0' && scan_result != PSCAN_INCOMPLETE)
+ {
+ if (*(tmp++) == '\n')
+ cur_line++;
+ }
+
+ /* The one new line is always added to tail of query_buf */
+ if (scan_result != PSCAN_INCOMPLETE)
+ cur_line++;
+
+ /*
+ * If we overflow, then we start at INT_MIN and move towards 0. So
+ * to get +ve wrap-around line number we have to add INT_MAX + 2 to
+ * this number. We add 2 due to the fact that we have difference
+ * of 1 in absolute value of INT_MIN and INT_MAX and another 1 as
+ * line number starts at one and not at zero.
+ */
+ if (cur_line < 0)
+ cur_line += INT_MAX + 2;
+
/*
* Send command if semicolon found, or if end of line and we're in
* single-line mode.
@@ -256,6 +283,7 @@ MainLoop(FILE *source)
/* execute query */
success = SendQuery(query_buf->data);
slashCmdStatus = success ? PSQL_CMD_SEND : PSQL_CMD_ERROR;
+ cur_line = 1;
/* transfer query to previous_buf by pointer-swapping */
{
@@ -303,6 +331,7 @@ MainLoop(FILE *source)
query_buf : previous_buf);
success = slashCmdStatus != PSQL_CMD_ERROR;
+ cur_line = 1;
if ((slashCmdStatus == PSQL_CMD_SEND || slashCmdStatus == PSQL_CMD_NEWEDIT) &&
query_buf->len == 0)
diff --git a/src/bin/psql/prompt.c b/src/bin/psql/prompt.c
index 26fca04..6a62e5f 100644
--- a/src/bin/psql/prompt.c
+++ b/src/bin/psql/prompt.c
@@ -44,6 +44,7 @@
* in prompt2 -, *, ', or ";
* in prompt3 nothing
* %x - transaction status: empty, *, !, ? (unknown or no connection)
+ * %l - the line number
* %? - the error code of the last query (not yet implemented)
* %% - a percent sign
*
@@ -229,6 +230,9 @@ get_prompt(promptStatus_t status)
}
break;
+ case 'l':
+ sprintf(buf, "%d", cur_line);
+ break;
case '?':
/* not here yet */
break;
diff --git a/src/bin/psql/prompt.h b/src/bin/psql/prompt.h
index 4d2f7e3..f1f80d2 100644
--- a/src/bin/psql/prompt.h
+++ b/src/bin/psql/prompt.h
@@ -22,4 +22,7 @@ typedef enum _promptStatus
char *get_prompt(promptStatus_t status);
+/* Current line number */
+int cur_line;
+
#endif /* PROMPT_H */
--
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