diff options
Diffstat (limited to 'shell/ash.c')
| -rw-r--r-- | shell/ash.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/shell/ash.c b/shell/ash.c index 6befe0f..4fbae24 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -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); |