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Further tweaking of the readfile() function in pg_ctl.

Don't leak a file descriptor if the file is empty or we can't read its size.Expect there to be a newline at the end of the last line, too. If thereisn't, ignore anything after the last newline. This makes it a tiny bitmore robust in case the file is appended to concurrently, so that we don'treturn the last line if it hasn't been fully written yet. And this makesthe code a bit less obscure, anyway. Per Tom Lane's suggestion.Backpatch to all supported branches.

1 parent447dad7 commitd2a5f32Copy full SHA for d2a5f32

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+11

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src/bin/pg_ctl
- pg_ctl.c

1 file changed

+11

-4

lines changed

`‎src/bin/pg_ctl/pg_ctl.c‎`

Lines changed: 11 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -328,10 +328,14 @@ readfile(const char *path)`
`328`	`328`	`if (fd<0)`
`329`	`329`	`returnNULL;`
`330`	`330`	`if (fstat(fd,&statbuf)<0)`
	`331`	`+{`
	`332`	`+close(fd);`
`331`	`333`	`returnNULL;`
	`334`	`+}`
`332`	`335`	`if (statbuf.st_size==0)`
`333`	`336`	`{`
`334`	`337`	`/* empty file */`
	`338`	`+close(fd);`
`335`	`339`	`result= (char*)pg_malloc(sizeof(char));`
`336`	`340`	`*result=NULL;`
`337`	`341`	`returnresult;`
`@@ -347,14 +351,17 @@ readfile(const char *path)`
`347`	`351`	`returnNULL;`
`348`	`352`	`}`
`349`	`353`
`350`		`-/* count newlines */`
	`354`	`+/*`
	`355`	`+ * Count newlines. We expect there to be a newline after each full line,`
	`356`	`+ * including one at the end of file. If there isn't a newline at the end,`
	`357`	`+ * any characters after the last newline will be ignored.`
	`358`	`+ */`
`351`	`359`	`nlines=0;`
`352`		`-for (i=0;i<len-1;i++)`
	`360`	`+for (i=0;i<len;i++)`
`353`	`361`	`{`
`354`	`362`	`if (buffer[i]=='\n')`
`355`	`363`	`nlines++;`
`356`	`364`	`}`
`357`		`-nlines++;/* account for the last line */`
`358`	`365`
`359`	`366`	`/* set up the result buffer */`
`360`	`367`	`result= (char*)pg_malloc((nlines+1)sizeof(char*));`
`@@ -364,7 +371,7 @@ readfile(const char *path)`
`364`	`371`	`n=0;`
`365`	`372`	`for (i=0;i<len;i++)`
`366`	`373`	`{`
`367`		`-if (buffer[i]=='\n'\|\|i==len-1)`
	`374`	`+if (buffer[i]=='\n')`
`368`	`375`	`{`
`369`	`376`	`intslen=&buffer[i]-linebegin+1;`
`370`	`377`	`char*linebuf=pg_malloc(slen+1);`

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Commitd2a5f32

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`‎src/bin/pg_ctl/pg_ctl.c‎`

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