diff options
Diffstat (limited to 'toys')
| -rw-r--r-- | toys/pending/sh.c | 99 |
1 files changed, 71 insertions, 28 deletions
diff --git a/toys/pending/sh.c b/toys/pending/sh.c index bba410aa..e84d8dfb 100644 --- a/toys/pending/sh.c +++ b/toys/pending/sh.c @@ -22,16 +22,62 @@ * TODO: test that $PS1 color changes work without stupid \[ \] hack * TODO: make fake pty wrapper for test infrastructure * TODO: // Handle embedded NUL bytes in the command line. - * existing but considered builtins: false kill pwd true time + * existing but considered builtins: kill pwd time * buitins: alias bg command fc fg getopts jobs newgrp read umask unalias wait - * "special" builtins: break continue : . eval exec export readonly return set - * shift times trap unset + * disown umask suspend source pushd popd dirs logout times trap + * unset local export readonly set : . let history declare + * "special" builtins: break continue eval exec return shift + * builtins with extra shell behavior: kill pwd time test * | & ; < > ( ) $ ` \ " ' <space> <tab> <newline> * * ? [ # ~ = % * ! { } case do done elif else esac fi for if in then until while * [[ ]] function select * $@ $* $# $? $- $$ $! $0 * ENV HOME IFS LANG LC_ALL LINENO PATH PPID PS1 PS2 PS4 PWD + +// EUID GROUPS HOSTNAME HOSTTYPE=$(uname -m) MACHTYPE=$HOSTTYPE-unknown-linux +// OLDPWD OSTYPE=linux/android PIPESTATUS PPID PWD RANDOM REPLY SECONDS UID +// COLUMNS LINES HOME SHELL +// IFS PATH +// PS0 PS1='$ ' PS2='> ' PS3 + +ENV - if [ -n "$ENV" ]; then . "$ENV"; fi # BASH_ENV - synonym for ENV +#EXECIGNORE, FIGNORE, GLOBIGNORE +FUNCNEST - maximum function nesting level (abort when above) + +BASH - argv0? +BASHPID - synonym for $$ HERE +BASH_SUBSHELL - SHLVL synonym +BASH_EXECUTION_STRING - -c argument +BASH_VERSION - toybox version + +REPLY - set by input with no args +SHLVL - nested level of subshells, starting with 1 +UID - readonly +EUID - readonly +PPID - readonly + +automatically set: +HOME SHELL HOSTNAME +HOSTTYPE - uname -m +MACHTYPE - $(uname -m)-unknown-linux +OSTYPE - unaem -o +OPTARG - set by getopts builtin +OPTIND - set by getopts builtin +OPTERR +OLDPWD - set by cd each time +PWD - set by cd +COLUMNS LINES - set at start and by winch + +PROMPT_COMMAND PROMPT_DIRTRIM PS0 PS1 PS2 PS3 PS4 + +unsettable (assignments ignored before then) +LINENO SECONDS RANDOM +GROUPS - id -g +HISTCMD - history number + +TMOUT - used by read + * label: * TODO: test exit from "trap EXIT" doesn't recurse * TODO: ! history expansion @@ -145,6 +191,7 @@ static void syntax_err(char *msg, ...) if (*toys.optargs) xexit(); } +// append to array with null terminator and realloc as necessary void array_add(char ***list, unsigned count, char *data) { if (!(count&31)) *list = xrealloc(*list, sizeof(char *)*(count+33)); @@ -217,8 +264,8 @@ static char *getvar(char *s) return getvarlen(s, strlen(s)); } -// returns pointer to next unquoted (or double quoted if dquot) char. -// handle \ '' "" `` $() +// returns offset of next unquoted (or double quoted if dquot) char. +// handles \ '' "" `` $() int skip_quote(char *s, int dquot, int *depth) { int i, q = dquot ? *depth : 0; @@ -228,12 +275,13 @@ int skip_quote(char *s, int dquot, int *depth) char c = s[i], qq = q ? toybuf[q-1] : 0; if (c == '\\') i++; + else if (dquot && q==1 && qq=='"' && c!='"') break; else if (qq!='\'' && c=='$' && s[1]=='(') { toybuf[q++] = ')'; i++; } else if (q && qq==c) q--; else if ((!q || qq==')') && (c=='"' || c=='\'' || c=='`')) toybuf[q++] = c; - else if (!q || (dquot && q==1 && qq=='"')) break; + else if (!q) break; } if (dquot) *depth = q; @@ -253,15 +301,14 @@ void add_arg(struct arg_list **list, char *arg) *list = al; } -// quote removal, brace, tilde, parameter/variable, $(command), -// $((arithmetic)), split, path -#define NO_PATH (1<<0) -#define NO_SPLIT (1<<1) -#define NO_BRACE (1<<2) -#define NO_TILDE (1<<3) -#define NO_QUOTE (1<<4) -#define FORCE_COPY (1<<31) -#define FORCE_KEEP (1<<30) +#define NO_PATH (1<<0) // path expansion (wildcards) +#define NO_SPLIT (1<<1) // word splitting +#define NO_BRACE (1<<2) // {brace,expansion} +#define NO_TILDE (1<<3) // ~username/path +#define NO_QUOTE (1<<4) // quote removal +#define FORCE_COPY (1<<31) // don't keep original, copy even if not modified +#define FORCE_KEEP (1<<30) // this is a copy, free if not appended to delete +// TODO: parameter/variable $(command) $((math)) split pathglob // TODO: ${name:?error} causes an error/abort here (syntax_err longjmp?) // TODO: $1 $@ $* need args marshalled down here: function+structure? // arg = append to this @@ -272,7 +319,8 @@ void add_arg(struct arg_list **list, char *arg) static void expand_arg_nobrace(struct sh_arg *arg, char *old, unsigned flags, struct arg_list **delete) { - char *new = old; + char *new = old, *s, *ss, *sss; + int depth = 0; if (flags&FORCE_KEEP) old = 0; @@ -281,7 +329,6 @@ static void expand_arg_nobrace(struct sh_arg *arg, char *old, unsigned flags, // Tilde expansion if (!(flags&NO_TILDE) && *new == '~') { struct passwd *pw = 0; - char *s, *ss, *sss; // first expansion so don't need to free previous new ss = 0; @@ -300,7 +347,7 @@ static void expand_arg_nobrace(struct sh_arg *arg, char *old, unsigned flags, new = s; } -// ${ $(( $( $[ $' ` " ' + // parameter/variable expansion // TODO this is wrong if (*new == '$') { @@ -312,19 +359,16 @@ static void expand_arg_nobrace(struct sh_arg *arg, char *old, unsigned flags, } /* + for (s = new; *(s += skip_quote(s, 1, &depth));) { + if (*s == '`') { + +// ${ $(( $( $[ $' ` " ' + while (*s) { - if (!quote && !(flags&NO_BRACE) && *s == '{') { -TODO this recurses - } else if (quote != '*s == '$') { + if (quote != '*s == '$') { // *@#?-$!_0 "Special Paremeters" ($0 not affected by shift) // 0-9 positional parameters if (s[1] == '$' - -// EUID GROUPS HOSTNAME HOSTTYPE=$(uname -m) MACHTYPE=$HOSTTYPE-unknown-linux -// OLDPWD OSTYPE=linux/android PIPESTATUS PPID PWD RANDOM REPLY SECONDS UID -// COLUMNS LINES HOME SHELL -// IFS PATH -// PS0 PS1='$ ' PS2='> ' PS3 } } @@ -489,7 +533,6 @@ static void expand_arg(struct sh_arg *arg, char *old, unsigned flags, } } - // Expand exactly one arg, returning NULL if it split. static char *expand_one_arg(char *new, unsigned flags, struct arg_list **del) { |