diff options
Diffstat (limited to 'shell/hush.c')
| -rw-r--r-- | shell/hush.c | 31 |
1 files changed, 26 insertions, 5 deletions
diff --git a/shell/hush.c b/shell/hush.c index 8d9292e..fd2a3d0 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -41,14 +41,29 @@ * * TODOs: * grep for "TODO" and fix (some of them are easy) + * make complex ${var%...} constructs support optional + * make here documents optional * special variables (done: PWD, PPID, RANDOM) + * follow IFS rules more precisely, including update semantics * tilde expansion * aliases - * follow IFS rules more precisely, including update semantics * builtins mandated by standards we don't support: - * [un]alias, command, fc, getopts, newgrp, readonly, times - * make complex ${var%...} constructs support optional - * make here documents optional + * [un]alias, command, fc, getopts, readonly, times: + * command -v CMD: print "/path/to/CMD" + * prints "CMD" for builtins + * prints "alias ALIAS='EXPANSION'" for aliases + * prints nothing and sets $? to 1 if not found + * command -V CMD: print "CMD is /path/CMD|a shell builtin|etc" + * command [-p] CMD: run CMD, even if a function CMD also exists + * (can use this to override standalone shell as well) + * -p: use default $PATH + * readonly VAR[=VAL]...: make VARs readonly + * readonly [-p]: list all such VARs (-p has no effect in bash) + * getopts: getopt() for shells + * times: print getrusage(SELF/CHILDREN).ru_utime/ru_stime + * fc -l[nr] [BEG] [END]: list range of commands in history + * fc [-e EDITOR] [BEG] [END]: edit/rerun range of commands + * fc -s [PAT=REP] [CMD]: rerun CMD, replacing PAT with REP * * Bash compat TODO: * redirection of stdout+stderr: &> and >& @@ -64,8 +79,13 @@ * The EXPR is evaluated according to ARITHMETIC EVALUATION. * This is exactly equivalent to let "EXPR". * $[EXPR]: synonym for $((EXPR)) + * indirect expansion: ${!VAR} + * substring op on @: ${@:n:m} * * Won't do: + * Some builtins mandated by standards: + * newgrp [GRP]: not a builtin in bash but a suid binary + * which spawns a new shell with new group ID * In bash, export builtin is special, its arguments are assignments * and therefore expansion of them should be "one-word" expansion: * $ export i=`echo 'a b'` # export has one arg: "i=a b" @@ -5703,7 +5723,7 @@ static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, cha if (errmsg) goto arith_err; debug_printf_varexp("len:'%s'=%lld\n", exp_word, (long long)len); - if (len >= 0) { /* bash compat: len < 0 is illegal */ + if (len >= 0) { if (beg < 0) { /* negative beg counts from the end */ beg = (arith_t)strlen(val) + beg; @@ -5723,6 +5743,7 @@ static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, cha } debug_printf_varexp("val:'%s'\n", val); } else +//TODO: in bash, len=-n means strlen()-n #endif /* HUSH_SUBSTR_EXPANSION && FEATURE_SH_MATH */ { die_if_script("malformed ${%s:...}", var); |