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Clean up code for widget_in() and widget_out().

Given syntactically wrong input, widget_in() could call atof() with anindeterminate pointer argument, typically leading to a crash; or if itdidn't do that, it might return a NULL pointer, which again would leadto a crash since old-style C functions aren't supposed to do thingsthat way. Fix that by correcting the off-by-one syntax test andthrowing a proper error rather than just returning NULL.Also, since widget_in and widget_out have been marked STRICT for along time, their tests for null inputs are just dead code; remove 'em.In the oldest branches, also improve widget_out to use snprintf notsprintf, just to be sure.In passing, get rid of a long-since-useless sprintf into a local bufferthat nothing further is done with, and make some other minor codingstyle cleanups.In the intended regression-testing usage of these functions, none ofthis is very significant; but if the regression test database wereleft around in a production installation, these bugs could amountto a minor security hazard.Piotr Stefaniak, Michael Paquier, and Tom Lane

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src/test/regress
- regress.c

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+11

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`‎src/test/regress/regress.c`

Lines changed: 11 additions & 12 deletions

Original file line number	Diff line number	Diff line change
`@@ -249,34 +249,33 @@ WIDGET *`
`249`	`249`	`widget_in(char*str)`
`250`	`250`	`{`
`251`	`251`	`char*p,`
`252`		`-*coord[NARGS],`
`253`		`-buf2[1000];`
	`252`	`+*coord[NARGS];`
`254`	`253`	`inti;`
`255`	`254`	`WIDGET*result;`
`256`	`255`
`257`		`-if (str==NULL)`
`258`		`-returnNULL;`
`259`	`256`	`for (i=0,p=str;p&&i<NARGS&&p!=RDELIM;p++)`
`260`		`-if (p==','\|\| (p==LDELIM&& !i))`
	`257`	`+{`
	`258`	`+if (p==DELIM\|\| (p==LDELIM&&i==0))`
`261`	`259`	`coord[i++]=p+1;`
`262`		`-if (i<NARGS-1)`
`263`		`-returnNULL;`
	`260`	`+}`
	`261`	`+`
	`262`	`+if (i<NARGS)`
	`263`	`+ereport(ERROR,`
	`264`	`+(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),`
	`265`	`+errmsg("invalid input syntax for type widget: \"%s\"",`
	`266`	`+str)));`
	`267`	`+`
`264`	`268`	`result= (WIDGET*)palloc(sizeof(WIDGET));`
`265`	`269`	`result->center.x=atof(coord[0]);`
`266`	`270`	`result->center.y=atof(coord[1]);`
`267`	`271`	`result->radius=atof(coord[2]);`
`268`	`272`
`269`		`-snprintf(buf2,sizeof(buf2),"widget_in: read (%f, %f, %f)\n",`
`270`		`-result->center.x,result->center.y,result->radius);`
`271`	`273`	`returnresult;`
`272`	`274`	`}`
`273`	`275`
`274`	`276`	`char*`
`275`	`277`	`widget_out(WIDGET*widget)`
`276`	`278`	`{`
`277`		`-if (widget==NULL)`
`278`		`-returnNULL;`
`279`		`-`
`280`	`279`	`returnpsprintf("(%g,%g,%g)",`
`281`	`280`	`widget->center.x,widget->center.y,widget->radius);`
`282`	`281`	`}`

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Commit1cb63c7

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`‎src/test/regress/regress.c`

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