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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 parent160984c commit2a49585Copy full SHA for 2a49585

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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
`@@ -338,10 +338,14 @@ readfile(const char *path)`
`338`	`338`	`if (fd<0)`
`339`	`339`	`returnNULL;`
`340`	`340`	`if (fstat(fd,&statbuf)<0)`
	`341`	`+{`
	`342`	`+close(fd);`
`341`	`343`	`returnNULL;`
	`344`	`+}`
`342`	`345`	`if (statbuf.st_size==0)`
`343`	`346`	`{`
`344`	`347`	`/* empty file */`
	`348`	`+close(fd);`
`345`	`349`	`result= (char*)pg_malloc(sizeof(char));`
`346`	`350`	`*result=NULL;`
`347`	`351`	`returnresult;`
`@@ -357,14 +361,17 @@ readfile(const char *path)`
`357`	`361`	`returnNULL;`
`358`	`362`	`}`
`359`	`363`
`360`		`-/* count newlines */`
	`364`	`+/*`
	`365`	`+ * Count newlines. We expect there to be a newline after each full line,`
	`366`	`+ * including one at the end of file. If there isn't a newline at the end,`
	`367`	`+ * any characters after the last newline will be ignored.`
	`368`	`+ */`
`361`	`369`	`nlines=0;`
`362`		`-for (i=0;i<len-1;i++)`
	`370`	`+for (i=0;i<len;i++)`
`363`	`371`	`{`
`364`	`372`	`if (buffer[i]=='\n')`
`365`	`373`	`nlines++;`
`366`	`374`	`}`
`367`		`-nlines++;/* account for the last line */`
`368`	`375`
`369`	`376`	`/* set up the result buffer */`
`370`	`377`	`result= (char*)pg_malloc((nlines+1)sizeof(char*));`
`@@ -374,7 +381,7 @@ readfile(const char *path)`
`374`	`381`	`n=0;`
`375`	`382`	`for (i=0;i<len;i++)`
`376`	`383`	`{`
`377`		`-if (buffer[i]=='\n'\|\|i==len-1)`
	`384`	`+if (buffer[i]=='\n')`
`378`	`385`	`{`
`379`	`386`	`intslen=&buffer[i]-linebegin+1;`
`380`	`387`	`char*linebuf=pg_malloc(slen+1);`

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Commit2a49585

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`‎src/bin/pg_ctl/pg_ctl.c`

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