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Fix psql crash while parsing SQL file whose encoding is different from

client encoding and the client encoding is not *safe* one. Such anexample is, file encoding is UTF-8 and client encoding SJIS. Patchcontributed by Jiang Guiqing.

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src/bin/psql
- psqlscan.l

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`‎src/bin/psql/psqlscan.l`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1807,7 +1807,7 @@ prepare_buffer(const char txt, int len, char *txtcopy)`
`1807`	`1807`	`/* first byte should always be okay... */`
`1808`	`1808`	`newtxt[i] = txt[i];`
`1809`	`1809`	`i++;`
`1810`		`-while (--thislen > 0)`
	`1810`	`+while (--thislen > 0 && i < len)`
`1811`	`1811`	`newtxt[i++] = (char) 0xFF;`
`1812`	`1812`	`}`
`1813`	`1813`	`}`

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Commit53edb8d

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`‎src/bin/psql/psqlscan.l`

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