sed: Fix parsing bug in find_delim
's/[[x=]//' was parsed as 's/[[=x]//' which (correctly) raises an error because the "second delimiter is missing", here =]. The two got mixed up because the parser didn't return to the "inside bracket"-state after encountering an opening bracket while inside the bracket expression.
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sed.c
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sed.c
@ -551,6 +551,7 @@ find_delim(char *s, Rune delim, int do_brackets)
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r == '.' ||
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r == '=') ) { state = CLASS_INSIDE ; c = r; }
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else if (state == INSIDE_OPENING && r == ']' ) { state = OUTSIDE ; }
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else if (state == INSIDE_OPENING ) { state = BRACKETS_INSIDE ; }
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else if (state == BRACKETS_INSIDE && r == '[' ) { state = INSIDE_OPENING ; }
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else if (state == BRACKETS_INSIDE && r == ']' ) { state = OUTSIDE ; }
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else if (state == OUTSIDE && escape ) { escape = 0 ; }
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