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Avoid crash in "postgres -C guc" for a GUC with a null string value.

Emit "(null)" instead, which was the behavior all along on platformsthat don't crash, eg OS X. Per report from Jehan-Guillaume de Rorthais.Back-patch to 9.2 where -C option was introduced.Michael PaquierReport: <20160615204036.2d35d86a@firost>

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src/backend/postmaster
- postmaster.c

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`‎src/backend/postmaster/postmaster.c`

Lines changed: 7 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -821,10 +821,14 @@ PostmasterMain(int argc, char *argv[])`
`821`	`821`	`if (output_config_variable!=NULL)`
`822`	`822`	`{`
`823`	`823`	`/*`
`824`		`- * permission is handled because the user is reading inside the data`
`825`		`- * dir`
	`824`	`+ * "-C guc" was specified, so print GUC's value and exit. No extra`
	`825`	`+ * permission check is needed because the user is reading inside the`
	`826`	`+ * data dir.`
`826`	`827`	`*/`
`827`		`-puts(GetConfigOption(output_config_variable, false, false));`
	`828`	`+constchar*config_val=GetConfigOption(output_config_variable,`
	`829`	`+ false, false);`
	`830`	`+`
	`831`	`+puts(config_val ?config_val :"(null)");`
`828`	`832`	`ExitPostmaster(0);`
`829`	`833`	`}`
`830`	`834`

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Commit4f5995d

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`‎src/backend/postmaster/postmaster.c`

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