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test_split_into_argv: update to post-VS7 behaviour.
The old behaviour is still present under an ifdef based on _MSC_VER, so it should still appear in the w32old builds we're still making.
This commit is contained in:
Simon Tatham
parent
d028fd1779
commit
49b91bc128
@ -19,6 +19,143 @@
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#include "putty.h"
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#include "putty.h"
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/*
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* The precise argument-breaking rules vary with compiler version, or
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* rather, with the crt0-type startup code that comes with each
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* compiler's C library. We do our best to match the compiler version,
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* so that we faithfully imitate in our GUI utilities what the
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* corresponding set of CLI utilities can't be prevented from doing.
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*
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* The basic rules are:
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*
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* - Single quotes are not special characters.
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*
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* - Double quotes are removed, but within them spaces cease to be
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* special.
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*
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* - Backslashes are _only_ special when a sequence of them appear
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* just before a double quote. In this situation, they are treated
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* like C backslashes: so \" just gives a literal quote, \\" gives
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* a literal backslash and then opens or closes a double-quoted
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* segment, \\\" gives a literal backslash and then a literal
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* quote, \\\\" gives two literal backslashes and then opens/closes
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* a double-quoted segment, and so forth. Note that this behaviour
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* is identical inside and outside double quotes.
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*
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* - Two successive double quotes become one literal double quote,
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* but only _inside_ a double-quoted segment. Outside, they just
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* form an empty double-quoted segment (which may cause an empty
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* argument word).
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*
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* That only leaves the interesting question of what happens when one
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* or more backslashes precedes two or more double quotes, starting
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* inside a double-quoted string.
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*
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* I investigated this in an ordinary CLI program, using the
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* toolchain's crt0 to split a command line of the form
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*
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* "a\\\"""b c" d
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*
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* Here I tabulate number of backslashes (across the top) against
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* number of quotes (down the left), and indicate how many backslashes
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* are output, how many quotes are output, and whether a quoted
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* segment is open at the end of the sequence:
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*
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* backslashes
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*
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* 0 1 2 3 4
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*
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* 0 0,0,y | 1,0,y 2,0,y 3,0,y 4,0,y
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* --------+-----------------------------
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* 1 0,0,n | 0,1,y 1,0,n 1,1,y 2,0,n
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* q 2 0,1,y | 0,1,n 1,1,y 1,1,n 2,1,y
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* u 3 0,1,n | 0,2,y 1,1,n 1,2,y 2,1,n
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* o 4 0,2,y | 0,2,n 1,2,y 1,2,n 2,2,y
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* t 5 0,2,n | 0,3,y 1,2,n 1,3,y 2,2,n
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* e 6 0,3,y | 0,3,n 1,3,y 1,3,n 2,3,y
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* s 7 0,3,n | 0,4,y 1,3,n 1,4,y 2,3,n
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* 8 0,4,y | 0,4,n 1,4,y 1,4,n 2,4,y
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*
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* The row at the top of this table, with quotes=0, demonstrates what
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* I claimed above, that when a sequence of backslashes are not
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* followed by a double quote, they don't act specially at all. The
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* rest of the table shows that the backslashes escape each other in
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* pairs (so that with 2n or 2n+1 input backslashes you get n output
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* ones); if there's an odd number of input backslashes then the last
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* one escapes the first double quote (so you get a literal quote and
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* enter a quoted string); thereafter, each input quote character
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* either opens or closes a quoted string, and if it closes one, it
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* generates a literal " as a side effect.
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*
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* But here's the corresponding table from the older Visual Studio 7:
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*
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* backslashes
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*
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* 0 1 2 3 4
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*
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* 0 0,0,y | 1,0,y 2,0,y 3,0,y 4,0,y
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* --------+-----------------------------
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* 1 0,0,n | 0,1,y 1,0,n 1,1,y 2,0,n
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* q 2 0,1,n | 0,1,n 1,1,n 1,1,n 2,1,n
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* u 3 0,1,y | 0,2,n 1,1,y 1,2,n 2,1,y
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* o 4 0,1,n | 0,2,y 1,1,n 1,2,y 2,1,n
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* t 5 0,2,n | 0,2,n 1,2,n 1,2,n 2,2,n
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* e 6 0,2,y | 0,3,n 1,2,y 1,3,n 2,2,y
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* s 7 0,2,n | 0,3,y 1,2,n 1,3,y 2,2,n
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* 8 0,3,n | 0,3,n 1,3,n 1,3,n 2,3,n
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* 9 0,3,y | 0,4,n 1,3,y 1,4,n 2,3,y
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* 10 0,3,n | 0,4,y 1,3,n 1,4,y 2,3,n
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* 11 0,4,n | 0,4,n 1,4,n 1,4,n 2,4,n
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*
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* There is very weird mod-3 behaviour going on here in the
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* number of quotes, and it even applies when there aren't any
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* backslashes! How ghastly.
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*
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* With a bit of thought, this extremely odd diagram suddenly
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* coalesced itself into a coherent, if still ghastly, model of
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* how things work:
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*
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* - As before, backslashes are only special when one or more
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* of them appear contiguously before at least one double
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* quote. In this situation the backslashes do exactly what
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* you'd expect: each one quotes the next thing in front of
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* it, so you end up with n/2 literal backslashes (if n is
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* even) or (n-1)/2 literal backslashes and a literal quote
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* (if n is odd). In the latter case the double quote
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* character right after the backslashes is used up.
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*
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* - After that, any remaining double quotes are processed. A
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* string of contiguous unescaped double quotes has a mod-3
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* behaviour:
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*
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* * inside a quoted segment, a quote ends the segment.
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* * _immediately_ after ending a quoted segment, a quote
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* simply produces a literal quote.
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* * otherwise, outside a quoted segment, a quote begins a
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* quoted segment.
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*
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* So, for example, if we started inside a quoted segment
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* then two contiguous quotes would close the segment and
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* produce a literal quote; three would close the segment,
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* produce a literal quote, and open a new segment. If we
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* started outside a quoted segment, then two contiguous
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* quotes would open and then close a segment, producing no
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* output (but potentially creating a zero-length argument);
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* but three quotes would open and close a segment and then
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* produce a literal quote.
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*/
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/*
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* We select between two behaviours depending on the version of Visual
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* Studio (see large comment below). I don't know exactly when the bug
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* fix happened, but I know that VS7 had the odd mod-3 behaviour.
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*/
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#if _MSC_VER < 1400
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#define MOD3 1
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#else
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#define MOD3 0
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#endif
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void split_into_argv(char *cmdline, int *argc, char ***argv,
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void split_into_argv(char *cmdline, int *argc, char ***argv,
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char ***argstart)
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char ***argstart)
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{
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{
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@ -27,107 +164,6 @@ void split_into_argv(char *cmdline, int *argc, char ***argv,
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char **outputargv, **outputargstart;
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char **outputargv, **outputargstart;
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int outputargc;
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int outputargc;
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/*
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* These argument-breaking rules apply to Visual Studio 7, which
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* is currently the compiler expected to be used for PuTTY. Visual
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* Studio 10 has different rules, lacking the curious mod 3
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* behaviour of consecutive quotes described below; I presume they
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* fixed a bug. As and when we migrate to a newer compiler, we'll
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* have to adjust this to match; however, for the moment we
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* faithfully imitate in our GUI utilities what our CLI utilities
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* can't be prevented from doing.
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*
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* When I investigated this, at first glance the rules appeared to
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* be:
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*
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* - Single quotes are not special characters.
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*
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* - Double quotes are removed, but within them spaces cease
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* to be special.
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*
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* - Backslashes are _only_ special when a sequence of them
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* appear just before a double quote. In this situation,
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* they are treated like C backslashes: so \" just gives a
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* literal quote, \\" gives a literal backslash and then
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* opens or closes a double-quoted segment, \\\" gives a
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* literal backslash and then a literal quote, \\\\" gives
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* two literal backslashes and then opens/closes a
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* double-quoted segment, and so forth. Note that this
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* behaviour is identical inside and outside double quotes.
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*
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* - Two successive double quotes become one literal double
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* quote, but only _inside_ a double-quoted segment.
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* Outside, they just form an empty double-quoted segment
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* (which may cause an empty argument word).
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*
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* - That only leaves the interesting question of what happens
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* when one or more backslashes precedes two or more double
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* quotes, starting inside a double-quoted string. And the
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* answer to that appears somewhat bizarre. Here I tabulate
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* number of backslashes (across the top) against number of
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* quotes (down the left), and indicate how many backslashes
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* are output, how many quotes are output, and whether a
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* quoted segment is open at the end of the sequence:
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*
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* backslashes
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*
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* 0 1 2 3 4
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*
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* 0 0,0,y | 1,0,y 2,0,y 3,0,y 4,0,y
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* --------+-----------------------------
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* 1 0,0,n | 0,1,y 1,0,n 1,1,y 2,0,n
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* q 2 0,1,n | 0,1,n 1,1,n 1,1,n 2,1,n
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* u 3 0,1,y | 0,2,n 1,1,y 1,2,n 2,1,y
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* o 4 0,1,n | 0,2,y 1,1,n 1,2,y 2,1,n
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* t 5 0,2,n | 0,2,n 1,2,n 1,2,n 2,2,n
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* e 6 0,2,y | 0,3,n 1,2,y 1,3,n 2,2,y
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* s 7 0,2,n | 0,3,y 1,2,n 1,3,y 2,2,n
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* 8 0,3,n | 0,3,n 1,3,n 1,3,n 2,3,n
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* 9 0,3,y | 0,4,n 1,3,y 1,4,n 2,3,y
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* 10 0,3,n | 0,4,y 1,3,n 1,4,y 2,3,n
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* 11 0,4,n | 0,4,n 1,4,n 1,4,n 2,4,n
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*
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*
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* [Test fragment was of the form "a\\\"""b c" d.]
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*
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* There is very weird mod-3 behaviour going on here in the
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* number of quotes, and it even applies when there aren't any
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* backslashes! How ghastly.
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*
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* With a bit of thought, this extremely odd diagram suddenly
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* coalesced itself into a coherent, if still ghastly, model of
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* how things work:
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*
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* - As before, backslashes are only special when one or more
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* of them appear contiguously before at least one double
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* quote. In this situation the backslashes do exactly what
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* you'd expect: each one quotes the next thing in front of
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* it, so you end up with n/2 literal backslashes (if n is
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* even) or (n-1)/2 literal backslashes and a literal quote
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* (if n is odd). In the latter case the double quote
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* character right after the backslashes is used up.
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*
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* - After that, any remaining double quotes are processed. A
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* string of contiguous unescaped double quotes has a mod-3
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* behaviour:
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*
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* * inside a quoted segment, a quote ends the segment.
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* * _immediately_ after ending a quoted segment, a quote
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* simply produces a literal quote.
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* * otherwise, outside a quoted segment, a quote begins a
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* quoted segment.
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*
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* So, for example, if we started inside a quoted segment
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* then two contiguous quotes would close the segment and
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* produce a literal quote; three would close the segment,
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* produce a literal quote, and open a new segment. If we
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* started outside a quoted segment, then two contiguous
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* quotes would open and then close a segment, producing no
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* output (but potentially creating a zero-length argument);
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* but three quotes would open and close a segment and then
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* produce a literal quote.
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*/
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/*
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/*
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* First deal with the simplest of all special cases: if there
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* First deal with the simplest of all special cases: if there
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* aren't any arguments, return 0,NULL,NULL.
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* aren't any arguments, return 0,NULL,NULL.
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@ -197,11 +233,17 @@ void split_into_argv(char *cmdline, int *argc, char ***argv,
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/* Outside a quote segment, a quote starts one. */
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/* Outside a quote segment, a quote starts one. */
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if (!quote) quotes--;
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if (!quote) quotes--;
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/* Now we produce (n+1)/3 literal quotes... */
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#if !MOD3
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/* New behaviour: produce n/2 literal quotes... */
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for (i = 2; i <= quotes; i += 2) *q++ = '"';
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/* ... and end in a quote segment iff 2 divides n. */
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quote = (quotes % 2 == 0);
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#else
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/* Old behaviour: produce (n+1)/3 literal quotes... */
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for (i = 3; i <= quotes+1; i += 3) *q++ = '"';
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for (i = 3; i <= quotes+1; i += 3) *q++ = '"';
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/* ... and end in a quote segment iff 3 divides n. */
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/* ... and end in a quote segment iff 3 divides n. */
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quote = (quotes % 3 == 0);
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quote = (quotes % 3 == 0);
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#endif
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}
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}
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}
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}
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} else {
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} else {
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@ -231,6 +273,100 @@ const struct argv_test {
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* We generate this set of tests by invoking ourself with
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* We generate this set of tests by invoking ourself with
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* `-generate'.
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* `-generate'.
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*/
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*/
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#if !MOD3
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/* Newer behaviour, with no weird mod-3 glitch. */
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{"ab c\" d", {"ab", "c d", NULL}},
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{"a\"b c\" d", {"ab c", "d", NULL}},
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{"a\"\"b c\" d", {"ab", "c d", NULL}},
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{"a\"\"\"b c\" d", {"a\"b c", "d", NULL}},
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{"a\"\"\"\"b c\" d", {"a\"b", "c d", NULL}},
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{"a\"\"\"\"\"b c\" d", {"a\"\"b c", "d", NULL}},
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{"a\"\"\"\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
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{"a\"\"\"\"\"\"\"b c\" d", {"a\"\"\"b c", "d", NULL}},
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{"a\"\"\"\"\"\"\"\"b c\" d", {"a\"\"\"b", "c d", NULL}},
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{"a\\b c\" d", {"a\\b", "c d", NULL}},
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{"a\\\"b c\" d", {"a\"b", "c d", NULL}},
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{"a\\\"\"b c\" d", {"a\"b c", "d", NULL}},
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{"a\\\"\"\"b c\" d", {"a\"b", "c d", NULL}},
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{"a\\\"\"\"\"b c\" d", {"a\"\"b c", "d", NULL}},
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{"a\\\"\"\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
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{"a\\\"\"\"\"\"\"b c\" d", {"a\"\"\"b c", "d", NULL}},
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{"a\\\"\"\"\"\"\"\"b c\" d", {"a\"\"\"b", "c d", NULL}},
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{"a\\\"\"\"\"\"\"\"\"b c\" d", {"a\"\"\"\"b c", "d", NULL}},
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{"a\\\\b c\" d", {"a\\\\b", "c d", NULL}},
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{"a\\\\\"b c\" d", {"a\\b c", "d", NULL}},
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{"a\\\\\"\"b c\" d", {"a\\b", "c d", NULL}},
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{"a\\\\\"\"\"b c\" d", {"a\\\"b c", "d", NULL}},
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{"a\\\\\"\"\"\"b c\" d", {"a\\\"b", "c d", NULL}},
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{"a\\\\\"\"\"\"\"b c\" d", {"a\\\"\"b c", "d", NULL}},
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{"a\\\\\"\"\"\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
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{"a\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b c", "d", NULL}},
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{"a\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b", "c d", NULL}},
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{"a\\\\\\b c\" d", {"a\\\\\\b", "c d", NULL}},
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{"a\\\\\\\"b c\" d", {"a\\\"b", "c d", NULL}},
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||||||
|
{"a\\\\\\\"\"b c\" d", {"a\\\"b c", "d", NULL}},
|
||||||
|
{"a\\\\\\\"\"\"b c\" d", {"a\\\"b", "c d", NULL}},
|
||||||
|
{"a\\\\\\\"\"\"\"b c\" d", {"a\\\"\"b c", "d", NULL}},
|
||||||
|
{"a\\\\\\\"\"\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
|
||||||
|
{"a\\\\\\\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b c", "d", NULL}},
|
||||||
|
{"a\\\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b", "c d", NULL}},
|
||||||
|
{"a\\\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"\"b c", "d", NULL}},
|
||||||
|
{"a\\\\\\\\b c\" d", {"a\\\\\\\\b", "c d", NULL}},
|
||||||
|
{"a\\\\\\\\\"b c\" d", {"a\\\\b c", "d", NULL}},
|
||||||
|
{"a\\\\\\\\\"\"b c\" d", {"a\\\\b", "c d", NULL}},
|
||||||
|
{"a\\\\\\\\\"\"\"b c\" d", {"a\\\\\"b c", "d", NULL}},
|
||||||
|
{"a\\\\\\\\\"\"\"\"b c\" d", {"a\\\\\"b", "c d", NULL}},
|
||||||
|
{"a\\\\\\\\\"\"\"\"\"b c\" d", {"a\\\\\"\"b c", "d", NULL}},
|
||||||
|
{"a\\\\\\\\\"\"\"\"\"\"b c\" d", {"a\\\\\"\"b", "c d", NULL}},
|
||||||
|
{"a\\\\\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"\"b c", "d", NULL}},
|
||||||
|
{"a\\\\\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"\"b", "c d", NULL}},
|
||||||
|
{"\"ab c\" d", {"ab c", "d", NULL}},
|
||||||
|
{"\"a\"b c\" d", {"ab", "c d", NULL}},
|
||||||
|
{"\"a\"\"b c\" d", {"a\"b c", "d", NULL}},
|
||||||
|
{"\"a\"\"\"b c\" d", {"a\"b", "c d", NULL}},
|
||||||
|
{"\"a\"\"\"\"b c\" d", {"a\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\"\"\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\"\"\"\"\"\"b c\" d", {"a\"\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\"\"\"\"\"\"\"b c\" d", {"a\"\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\"\"\"\"\"\"\"\"b c\" d", {"a\"\"\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\b c\" d", {"a\\b c", "d", NULL}},
|
||||||
|
{"\"a\\\"b c\" d", {"a\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\"\"b c\" d", {"a\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\"\"\"b c\" d", {"a\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\"\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\"\"\"\"\"b c\" d", {"a\"\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\"\"\"\"\"\"b c\" d", {"a\"\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\"\"\"\"\"\"\"b c\" d", {"a\"\"\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\"\"\"\"\"\"\"\"b c\" d", {"a\"\"\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\\b c\" d", {"a\\\\b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\"b c\" d", {"a\\b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\"\"b c\" d", {"a\\\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\"\"\"b c\" d", {"a\\\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\"\"\"\"b c\" d", {"a\\\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\"\"\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\\b c\" d", {"a\\\\\\b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\\\"b c\" d", {"a\\\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\\\"\"b c\" d", {"a\\\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\\\"\"\"b c\" d", {"a\\\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\\\"\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\\\"\"\"\"\"b c\" d", {"a\\\"\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\\\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\\\\b c\" d", {"a\\\\\\\\b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\\\\\"b c\" d", {"a\\\\b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\\\\\"\"b c\" d", {"a\\\\\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\\\\\"\"\"b c\" d", {"a\\\\\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\\\\\"\"\"\"b c\" d", {"a\\\\\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\\\\\"\"\"\"\"b c\" d", {"a\\\\\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\\\\\"\"\"\"\"\"b c\" d", {"a\\\\\"\"\"b c", "d", NULL}},
|
||||||
|
{"\"a\\\\\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"\"b", "c d", NULL}},
|
||||||
|
{"\"a\\\\\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"\"\"b c", "d", NULL}},
|
||||||
|
#else /* MOD3 */
|
||||||
|
/* VS7 mod-3 behaviour. */
|
||||||
{"ab c\" d", {"ab", "c d", NULL}},
|
{"ab c\" d", {"ab", "c d", NULL}},
|
||||||
{"a\"b c\" d", {"ab c", "d", NULL}},
|
{"a\"b c\" d", {"ab c", "d", NULL}},
|
||||||
{"a\"\"b c\" d", {"ab", "c d", NULL}},
|
{"a\"\"b c\" d", {"ab", "c d", NULL}},
|
||||||
@ -321,6 +457,7 @@ const struct argv_test {
|
|||||||
{"\"a\\\\\\\\\"\"\"\"\"\"b c\" d", {"a\\\\\"\"b c", "d", NULL}},
|
{"\"a\\\\\\\\\"\"\"\"\"\"b c\" d", {"a\\\\\"\"b c", "d", NULL}},
|
||||||
{"\"a\\\\\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"b", "c d", NULL}},
|
{"\"a\\\\\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"b", "c d", NULL}},
|
||||||
{"\"a\\\\\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"\"b", "c d", NULL}},
|
{"\"a\\\\\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"\"b", "c d", NULL}},
|
||||||
|
#endif /* MOD3 */
|
||||||
};
|
};
|
||||||
|
|
||||||
void out_of_memory(void)
|
void out_of_memory(void)
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user