ash: explain EXP_REDIR and why we (dont) glob redir filenames
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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shell/ash.c
11
shell/ash.c
@ -5545,6 +5545,17 @@ ash_arith(const char *s)
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#define EXP_TILDE 0x2 /* do normal tilde expansion */
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#define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
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#define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
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/* ^^^^^^^^^^^^^^ this is meant to support constructs such as "cmd >file*.txt"
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* POSIX says for this case:
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* Pathname expansion shall not be performed on the word by a
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* non-interactive shell; an interactive shell may perform it, but shall
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* do so only when the expansion would result in one word.
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* Currently, our code complies to the above rule by never globbing
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* redirection filenames.
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* Bash performs globbing, unless it is non-interactive and in POSIX mode.
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* (this means that on a typical Linux distro, bash almost always
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* performs globbing, and thus diverges from what we do).
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*/
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#define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
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#define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */
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#define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
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