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ash: fix another bit of var_bash4 bug

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But it _still_ doesn't pass! quoted case is a tough nut to crack

function                                             old     new   delta
redirect                                            1281    1286      +5
subevalvar                                          1141    1142      +1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-08-07 22:24:36 +02:00
parent 58a15cd9d2
commit 33bbb27e45
3 changed files with 16 additions and 5 deletions
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17
shell/ash.c
View File

@ -6234,7 +6234,7 @@ parse_sub_pattern(char *arg, int varflags)
unsigned char c;
//char *org_arg = arg;
//bb_error_msg("arg:'%s'", arg);
//bb_error_msg("arg:'%s' varflags:%x", arg, varflags);
idx = arg;
while (1) {
c = *arg;
@ -6248,9 +6248,20 @@ parse_sub_pattern(char *arg, int varflags)
}
}
*idx++ = c;
if (!(varflags & VSQUOTE) && c == '\\' && arg[1] == '\\')
arg++; /* skip both \\, not just first one */
arg++;
/*
* Example: v='ab\c'; echo ${v/\\b/_\\_\z_}
* The result is a_\_z_c (not a\_\_z_c)!
*
* Enable debug prints in this function and you'll see:
* ash: arg:'\\b/_\\_z_' varflags:d
* ash: pattern:'\\b' repl:'_\_z_'
* That is, \\b is interpreted as \\b, but \\_ as \_!
* IOW: search pattern and replace string treat backslashes
* differently! That is the reason why we check repl below:
*/
if (c == '\\' && *arg == '\\' && repl && !(varflags & VSQUOTE))
arg++; /* skip both '\', not just first one */
}
*idx = c; /* NUL */
//bb_error_msg("pattern:'%s' repl:'%s'", org_arg, repl);

2
shell/ash_test/ash-vars/var_bash4.right
View File

@ -11,7 +11,7 @@ Quoted: a*b_\_\z_
Source: a\bc
Replace str: _\\_\z_
Pattern: single backslash and b: "replace literal b"
Pattern: single backslash and b: "replace b"
In assignment: a\_\_z_c
Unquoted: a\_\_z_c
Quoted: a\_\_\z_c

2
shell/ash_test/ash-vars/var_bash4.tests
View File

@ -30,7 +30,7 @@ v='a\bc'
echo 'Source: ' "$v"
echo 'Replace str: ' '_\\_\z_'
echo 'Pattern: ' 'single backslash and b: "replace literal b"'
echo 'Pattern: ' 'single backslash and b: "replace b"'
r=${v/\b/_\\_\z_}
echo 'In assignment:' "$r"
echo 'Unquoted: ' ${v/\b/_\\_\z_}