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-rw-r--r--toys/pending/sh.c157
1 files changed, 88 insertions, 69 deletions
diff --git a/toys/pending/sh.c b/toys/pending/sh.c
index 4c3735d7..2fe47b47 100644
--- a/toys/pending/sh.c
+++ b/toys/pending/sh.c
@@ -174,19 +174,20 @@ GLOBALS(
} exec;
};
- // keep lineno here, we use it to work around a compiler limitation
+ // keep lineno here: used to work around compiler limitation in run_command()
long lineno;
char *ifs, *isexec;
unsigned options, jobcnt;
int hfd, pid, bangpid, varslen, shift, cdcount;
long long SECONDS;
+ // global and local variables
struct sh_vars {
long flags;
char *str;
} *vars;
- // Parsed function
+ // Parsed functions
struct sh_function {
char *name;
struct sh_pipeline { // pipeline segments
@@ -220,7 +221,7 @@ static int sh_run(char *new);
#define BUGBUG 0
// call with NULL to just dump FDs
-static void dump_state(struct sh_function *sp)
+static void dump_state(struct sh_function *sp, int err)
{
struct sh_pipeline *pl;
long i;
@@ -232,17 +233,18 @@ static void dump_state(struct sh_function *sp)
struct double_list *dl;
for (dl = sp->expect; dl; dl = (dl->next == sp->expect) ? 0 : dl->next)
- dprintf(255, "expecting %s\n", dl->data);
+ dprintf(err, "expecting %s\n", dl->data);
if (sp->pipeline)
- dprintf(255, "pipeline count=%d here=%d\n", sp->pipeline->prev->count,
+ dprintf(err, "pipeline count=%d here=%d\n", sp->pipeline->prev->count,
sp->pipeline->prev->here);
}
if (sp) for (pl = sp->pipeline; pl ; pl = (pl->next == sp->pipeline) ? 0 : pl->next) {
- for (i = 0; i<pl->arg->c; i++)
- dprintf(255, "arg[%d][%ld]=%s\n", q, i, pl->arg->v[i]);
- if (pl->arg->c<0) dprintf(255, "argc=%d\n", pl->arg->c);
- else dprintf(255, "type=%d term[%d]=%s\n", pl->type, q++, pl->arg->v[pl->arg->c]);
+ dprintf(err, "<%d> type=%d argc=%d", q++, pl->type, pl->arg->c);
+ for (i = 0; i<=pl->arg->c; i++)
+ if (i == pl->arg->c) dprintf(err, " term=%s", pl->arg->v ? pl->arg->v[pl->arg->c] : "");
+ else dprintf(err, " arg[%ld]=%s", i, pl->arg->v[i]);
+ dprintf(err, "\n");
}
if (dir) {
@@ -250,7 +252,7 @@ static void dump_state(struct sh_function *sp)
while ((dd = readdir(dir))) {
if (atoi(dd->d_name)!=fd && 0<readlinkat(fd, dd->d_name, buf,sizeof(buf)))
- dprintf(255, "OPEN %d: %s = %s\n", getpid(), dd->d_name, buf);
+ dprintf(err, "OPEN %d: %s = %s\n", getpid(), dd->d_name, buf);
}
closedir(dir);
}
@@ -273,6 +275,7 @@ static void syntax_err(char *s)
{
error_msg("syntax error: %s", s);
toys.exitval = 2;
+ if (!(TT.options&OPT_I)) xexit();
}
// append to array with null terminator and realloc as necessary
@@ -574,7 +577,7 @@ static char *parse_word(char *start, int early, int quote)
// backslash escapes
else if (*end == '\\') {
- if (!end[1] || (end[1]=='\n' && !end[2])) return 0;
+ if (!end[1] || (end[1]=='\n' && !end[2])) return early ? end+1 : 0;
end += 2;
} else if (*end == '$' && -1 != (i = stridx("({[", end[1]))) {
end++;
@@ -592,7 +595,7 @@ static char *parse_word(char *start, int early, int quote)
end++;
}
- return quote ? 0 : end;
+ return (quote && !early) ? 0 : end;
}
// Return next available high (>=10) file descriptor
@@ -917,8 +920,7 @@ static void collect_wildcards(char *new, long oo, struct sh_arg *deck)
static int expand_arg_nobrace(struct sh_arg *arg, char *str, unsigned flags,
struct arg_list **delete, struct sh_arg *ant)
{
- char cc, qq = flags&NO_QUOTE, sep[6], *new = str, *s, *ss, *ifs,
- *slice;
+ char cc, qq = flags&NO_QUOTE, sep[6], *new = str, *s, *ss, *ifs, *slice;
int ii = 0, oo = 0, xx, yy, dd, jj, kk, ll, mm;
struct sh_arg deck = {0};
@@ -1917,7 +1919,7 @@ static struct sh_pipeline *add_pl(struct sh_function *sp, struct sh_arg **arg)
// 1 to request another line of input (> prompt), -1 for syntax err
static int parse_line(char *line, struct sh_function *sp)
{
- char *start = line, *delete = 0, *end, *last = 0, *s, *ex, done = 0,
+ char *start = line, *delete = 0, *end, *s, *ex, done = 0,
*tails[] = {"fi", "done", "esac", "}", "]]", ")", 0};
struct sh_pipeline *pl = sp->pipeline ? sp->pipeline->prev : 0, *pl2, *pl3;
struct sh_arg *arg = 0;
@@ -1953,8 +1955,8 @@ static int parse_line(char *line, struct sh_function *sp)
}
start = 0;
- // Nope, new segment
- } else pl = 0;
+ // Nope, new segment if not self-managing type
+ } else if (pl->type < 128) pl = 0;
}
// Parse words, assemble argv[] pipelines, check flow control and HERE docs
@@ -2001,7 +2003,7 @@ if (BUGBUG>1) dprintf(255, "{%d:%s}\n", pl->type, ex ? ex : (sp->expect ? "*" :
// Parse next word and detect overflow (too many nested quotes).
if ((end = parse_word(start, 0, 0)) == (void *)1) goto flush;
-if (BUGBUG>1) dprintf(255, "[%.*s:%s] ", end ? (int)(end-start) : 0, start, ex ? : "");
+if (BUGBUG>1) dprintf(255, "[%d:%.*s:%s] ", pl ? pl->type : 0, end ? (int)(end-start) : 0, start, ex ? : "");
// Is this a new pipeline segment?
if (!pl) pl = add_pl(sp, &arg);
@@ -2017,57 +2019,35 @@ if (BUGBUG>1) dprintf(255, "[%.*s:%s] ", end ? (int)(end-start) : 0, start, ex ?
// Ok, we have a word. What does it _mean_?
- // case/esac parsing is weird, handle first
- if (ex && !memcmp(ex, "esac\0A", 6)
- && (pl->type || (*start==';' && end-start>1)))
- {
- // premature end of line only allowed at 'case x\nin' or after ;;
- if (start == end) {
- if (pl->type==1 && arg->c==2) break;
- if (pl->type==2 && arg->c==1 && **arg->v==';') break;
+ // case/esac parsing is weird (unbalanced parentheses!), handle first
+ i = ex && !strcmp(ex, "esac") && (pl->type || (*start==';' && end-start>1));
+ if (i) {
+ // Premature EOL in type 1 (case x\nin) or 2 (at start or after ;;) is ok
+ if (end == start) {
+ if (pl->type==128 && arg->c==2) break; // case x\nin
+ if (pl->type==129 && (!arg->c || (arg->c==1 && **arg->v==';'))) break;
s = "newline";
goto flush;
}
- // type 0: just got ;; so start new type 2 (catching "echo | ;;" errors)
+ // type 0 means just got ;; so start new type 2
if (!pl->type) {
- if (pl->prev->type==1) goto flush;
- for (;;) {
- if (arg->v[arg->c] && strcmp(arg->v[arg->c], "&")) goto flush;
- if (arg->c) break;
- arg = pl->prev->arg;
- }
- if (*arg->v) pl = add_pl(sp, &arg);
- pl->type = 2;
- }
-
- // Save argument
- arg_add(arg, s = xstrndup(start, end-start));
- start = end;
-
- // type 1: case x [\n] in
- if (pl->type==1 && arg->c==3) {
- if (strcmp(arg->v[2], "in")) goto flush;
- (pl = add_pl(sp, &arg))->type = 2;
-
- // type 2: [;;] [(] pattern [|pattern...] )
- } else if (pl->type==2) {
- *toybuf = ')';
- i = arg->c - (**arg->v==';' && arg->v[0][1]);
- if (arg->c==1 && **arg->v==';' && (long)parse_word(start,0,*s!='(')<2) {
- pl = add_pl(sp, &arg);
- sp->expect->prev->data = "esac\0B";
+ // catch "echo | ;;" errors
+ if (arg->v && arg->v[arg->c] && strcmp(arg->v[arg->c], "&")) goto flush;
+ if (!arg->c) {
+ if (pl->prev->type == 2) {
+ // Add a call to "true" between empty ) ;;
+ arg_add(arg, xstrdup(":"));
+ pl = add_pl(sp, &arg);
+ }
+ pl->type = 129;
} else {
- i -= arg->c>1 && *arg->v[1]=='(';
- if (i>0 && ((i&1)==!!strchr("|)", *s) || strchr(";(", *s)))
- goto flush;
- if (*s=='&' || !strcmp(s, "||")) goto flush;
- if (*s==')') pl = add_pl(sp, &arg);
+ // check for here documents
+ pl->count = -1;
+ continue;
}
}
- continue;
-
// Did we hit end of line or ) outside a function declaration?
// ) is only saved at start of a statement, ends current statement
} else if (end == start || (arg->c && *start == ')' && pl->type!='f')) {
@@ -2088,7 +2068,6 @@ if (BUGBUG>1) dprintf(255, "[%.*s:%s] ", end ? (int)(end-start) : 0, start, ex ?
// stop at EOL, else continue with new pipeline segment for )
if (end == start) done++;
pl->count = -1;
- last = 0;
continue;
}
@@ -2097,6 +2076,46 @@ if (BUGBUG>1) dprintf(255, "[%.*s:%s] ", end ? (int)(end-start) : 0, start, ex ?
arg_add(arg, s = xstrndup(start, end-start));
start = end;
+ // Second half of case/esac parsing
+ if (i) {
+ // type 1 (128): case x [\n] in
+ if (pl->type==128) {
+ if (arg->c==2 && strchr("()|;&", *s)) goto flush;
+ if (arg->c==3) {
+ if (strcmp(s, "in")) goto flush;
+ pl->type = 1;
+ (pl = add_pl(sp, &arg))->type = 129;
+ }
+
+ continue;
+
+ // type 2 (129): [;;] [(] pattern [|pattern...] )
+ } else {
+
+ // can't start with line break or ";;" or "case ? in ;;" without ")"
+ if (*s==';') {
+ if (arg->c>1 || (arg->c==1 && pl->prev->type==1)) goto flush;
+ } else pl->type = 2;
+ i = arg->c - (**arg->v==';' && arg->v[0][1]);
+ if (i==1 && !strcmp(s, "esac")) {
+ // esac right after "in" or ";;" ends block, fall through
+ if (arg->c>1) {
+ arg->v[1] = 0;
+ pl = add_pl(sp, &arg);
+ arg_add(arg, s);
+ } else pl->type = 0;
+ } else {
+ if (arg->c>1) i -= *arg->v[1]=='(';
+ if (i>0 && ((i&1)==!!strchr("|)", *s) || strchr(";(", *s)))
+ goto flush;
+ if (*s=='&' || !strcmp(s, "||")) goto flush;
+ if (*s==')') pl = add_pl(sp, &arg);
+
+ continue;
+ }
+ }
+ }
+
// is it a line break token?
if (strchr(";|&", *s) && strncmp(s, "&>", 2)) {
arg->c--;
@@ -2111,7 +2130,6 @@ if (BUGBUG>1) dprintf(255, "[%.*s:%s] ", end ? (int)(end-start) : 0, start, ex ?
// ;; and friends only allowed in case statements
} else if (*s == ';') goto flush;
- last = s;
// flow control without a statement is an error
if (!arg->c) goto flush;
@@ -2129,7 +2147,6 @@ if (BUGBUG>1) dprintf(255, "[%.*s:%s] ", end ? (int)(end-start) : 0, start, ex ?
// end function segment, expect function body
pl->count = -1;
- last = 0;
dlist_add(&sp->expect, "}");
dlist_add(&sp->expect, 0);
dlist_add(&sp->expect, "{");
@@ -2141,7 +2158,7 @@ if (BUGBUG>1) dprintf(255, "[%.*s:%s] ", end ? (int)(end-start) : 0, start, ex ?
} else if (ex && !memcmp(ex, "do\0A", 4)) {
// Sanity check and break the segment
- if (strncmp(s, "((", 2) && strchr(s, '=')) goto flush;
+ if (strncmp(s, "((", 2) && *varend(s)) goto flush;
pl->count = -1;
sp->expect->prev->data = "do\0C";
@@ -2179,8 +2196,9 @@ if (BUGBUG>1) dprintf(255, "[%.*s:%s] ", end ? (int)(end-start) : 0, start, ex ?
// for/select/case require var name on same line, can't break segment yet
if (!strcmp(s, "for") || !strcmp(s, "select") || !strcmp(s, "case")) {
- if (!pl->type) pl->type = 1;
- dlist_add(&sp->expect, (*s == 'c') ? "esac\0A" : "do\0A");
+// TODO why !pl->type here
+ if (!pl->type) pl->type = (*s == 'c') ? 128 : 1;
+ dlist_add(&sp->expect, (*s == 'c') ? "esac" : "do\0A");
continue;
}
@@ -2207,8 +2225,10 @@ if (BUGBUG>1) dprintf(255, "[%.*s:%s] ", end ? (int)(end-start) : 0, start, ex ?
// If we got here we expect a specific word to end this block: is this it?
else if (!strcmp(s, ex)) {
+ struct sh_arg *aa = pl->prev->arg;
+
// can't "if | then" or "while && do", only ; & or newline works
- if (last && strcmp(last, "&")) goto flush;
+ if (aa->v[aa->c] && strcmp(aa->v[aa->c], "&")) goto flush;
// consume word, record block end location in earlier !0 type blocks
free(dlist_lpop(&sp->expect));
@@ -2925,7 +2945,6 @@ if (BUGBUG) { int fd = open("/dev/tty", O_RDWR); if (fd == -1) fd = open("/dev/c
// TODO unify fmemopen() here with sh_run
if (cc) f = fmemopen(cc, strlen(cc), "r");
else if (TT.options&OPT_S) f = stdin;
-// TODO: syntax_err should exit from shell scripts
else if (!(f = fopen(*toys.optargs, "r"))) {
char *pp = getvar("PATH") ? : _PATH_DEFPATH;
@@ -2963,7 +2982,7 @@ if (BUGBUG) dprintf(255, "line=%s\n", new);
// returns 0 if line consumed, command if it needs more data
prompt = parse_line(new, &scratch);
-if (BUGBUG) dprintf(255, "prompt=%d\n", prompt), dump_state(&scratch);
+if (BUGBUG) dprintf(255, "prompt=%d\n", prompt), dump_state(&scratch, 255);
if (prompt != 1) {
// TODO: ./blah.sh one two three: put one two three in scratch.arg
if (!prompt) run_function(scratch.pipeline);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 13:33:43 +0000