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|
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -1,3 +1,4 @@
+
/* vi: set sw=4 ts=4: */
/*
* awk implementation for busybox
@@ -70,9 +71,14 @@ typedef struct chain_s {
} chain;
/* Function */
+typedef var *(*awk_cfunc)(var *res, var *args, int nargs);
typedef struct func_s {
unsigned nargs;
+ enum { AWKFUNC, CFUNC } type;
+ union {
+ awk_cfunc cfunc;
struct chain_s body;
+ } x;
} func;
/* I/O stream */
@@ -1453,7 +1459,8 @@ static void parse_program(char *p)
next_token(TC_FUNCTION);
g_pos++;
f = newfunc(t_string);
- f->body.first = NULL;
+ f->type = AWKFUNC;
+ f->x.body.first = NULL;
f->nargs = 0;
while (next_token(TC_VARIABLE | TC_SEQTERM) & TC_VARIABLE) {
v = findvar(ahash, t_string);
@@ -1462,7 +1469,7 @@ static void parse_program(char *p)
if (next_token(TC_COMMA | TC_SEQTERM) & TC_SEQTERM)
break;
}
- seq = &f->body;
+ seq = &f->x.body;
chain_group();
clear_array(ahash);
@@ -2547,7 +2554,8 @@ static var *evaluate(node *op, var *res)
var *vbeg, *v;
const char *sv_progname;
- if (!op->r.f->body.first)
+ if ((op->r.f->type == AWKFUNC) &&
+ !op->r.f->x.body.first)
syntax_error(EMSG_UNDEF_FUNC);
vbeg = v = nvalloc(op->r.f->nargs + 1);
@@ -2564,7 +2572,10 @@ static var *evaluate(node *op, var *res)
fnargs = vbeg;
sv_progname = g_progname;
- res = evaluate(op->r.f->body.first, res);
+ if (op->r.f->type == AWKFUNC)
+ res = evaluate(op->r.f->x.body.first, res);
+ else if (op->r.f->type == CFUNC)
+ res = op->r.f->x.cfunc(res, fnargs, op->r.f->nargs);
g_progname = sv_progname;
nvfree(fnargs);
@@ -2942,6 +2953,143 @@ static rstream *next_input_file(void)
#undef files_happen
}
+/* read the contents of an entire file */
+static char *get_file(const char *fname)
+{
+ FILE *F;
+ char *s = NULL;
+ int i, j, flen;
+
+ F = fopen(fname, "r");
+ if (!F) {
+ return NULL;
+ }
+
+ if (fseek(F, 0, SEEK_END) == 0) {
+ flen = ftell(F);
+ s = (char *)xmalloc(flen+4);
+ fseek(F, 0, SEEK_SET);
+ i = 1 + fread(s+1, 1, flen, F);
+ } else {
+ for (i=j=1; j>0; i+=j) {
+ s = (char *)xrealloc(s, i+4096);
+ j = fread(s+i, 1, 4094, F);
+ }
+ }
+
+ s[i] = '\0';
+ fclose(F);
+ return s;
+}
+
+
+/* parse_include():
+ *
+ * taken from parse_program from awk.c
+ * END{} is not parsed here, and BEGIN{} is executed immediately
+ */
+static void parse_include(char *p)
+{
+ uint32_t tclass;
+ chain *initseq = NULL;
+ chain tmp;
+ func *f;
+ var *v, *tv;
+
+ tv = nvalloc(1);
+ memset(&tmp, 0, sizeof(tmp));
+ g_pos = p;
+ t_lineno = 1;
+ while ((tclass = next_token(TC_EOF | TC_OPSEQ |
+ TC_OPTERM | TC_BEGIN | TC_FUNCDECL)) != TC_EOF) {
+ if (tclass & TC_OPTERM)
+ continue;
+
+ seq = &tmp;
+ if (tclass & TC_BEGIN) {
+ initseq = xzalloc(sizeof(chain));
+ seq = initseq;
+ chain_group();
+ } else if (tclass & TC_FUNCDECL) {
+ next_token(TC_FUNCTION);
+ g_pos++;
+ f = newfunc(t_string);
+ f->type = AWKFUNC;
+ f->x.body.first = NULL;
+ f->nargs = 0;
+ while (next_token(TC_VARIABLE | TC_SEQTERM) & TC_VARIABLE) {
+ v = findvar(ahash, t_string);
+ v->x.aidx = (f->nargs)++;
+
+ if (next_token(TC_COMMA | TC_SEQTERM) & TC_SEQTERM)
+ break;
+ }
+ seq = &(f->x.body);
+ chain_group();
+ clear_array(ahash);
+ }
+ }
+ if (initseq && initseq->first)
+ tv = evaluate(initseq->first, tv);
+ nvfree(tv);
+}
+
+
+/* include an awk file and run its BEGIN{} section */
+static xhash *includes = NULL;
+static void include_file(const char *filename)
+{
+ char *s;
+ var *v;
+ int oldlnr = g_lineno;
+ const char *oldprg = g_progname;
+
+ if (!includes)
+ includes = hash_init();
+
+ /* find out if the file has been included already */
+ v = findvar(includes, filename);
+ if (istrue(v))
+ return;
+ setvar_s(v, "1");
+
+ /* read include file */
+ s = get_file(filename);
+ if (!s) {
+ fprintf(stderr, "Could not open file.\n");
+ return;
+ }
+ g_lineno = 1;
+ g_progname = xstrdup(filename);
+ parse_include(s+1);
+ free(s);
+ g_lineno = oldlnr;
+ g_progname = oldprg;
+}
+
+static var *include(var *res, var *args, int nargs)
+{
+ const char *s;
+
+ nargs = nargs; /* shut up, gcc */
+ s = getvar_s(args);
+ if (s && (strlen(s) > 0))
+ include_file(s);
+
+ return res;
+}
+
+/* registers a global c function for the awk interpreter */
+static void register_cfunc(const char *name, awk_cfunc cfunc, int nargs)
+{
+ func *f;
+
+ f = newfunc(name);
+ f->type = CFUNC;
+ f->x.cfunc = cfunc;
+ f->nargs = nargs;
+}
+
int awk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int awk_main(int argc, char **argv)
{
@@ -3007,6 +3155,9 @@ int awk_main(int argc, char **argv)
*s1 = '=';
}
}
+
+ register_cfunc("include", include, 1);
+
opt_complementary = "v::f::"; /* -v and -f can occur multiple times */
opt = getopt32(argv, "F:v:f:W:", &opt_F, &list_v, &list_f, &opt_W);
argv += optind;
|
