218 lines
4.8 KiB
Diff
218 lines
4.8 KiB
Diff
--- a/editors/awk.c
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+++ b/editors/awk.c
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@@ -1,3 +1,4 @@
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+
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/* vi: set sw=4 ts=4: */
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/*
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* awk implementation for busybox
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@@ -81,9 +82,14 @@ typedef struct chain_s {
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} chain;
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/* Function */
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+typedef var *(*awk_cfunc)(var *res, var *args, int nargs);
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typedef struct func_s {
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unsigned nargs;
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+ enum { AWKFUNC, CFUNC } type;
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+ union {
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+ awk_cfunc cfunc;
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struct chain_s body;
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+ } x;
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} func;
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/* I/O stream */
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@@ -1473,7 +1479,8 @@ static void parse_program(char *p)
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next_token(TC_FUNCTION);
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g_pos++;
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f = newfunc(t_string);
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- f->body.first = NULL;
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+ f->type = AWKFUNC;
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+ f->x.body.first = NULL;
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f->nargs = 0;
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while (next_token(TC_VARIABLE | TC_SEQTERM) & TC_VARIABLE) {
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v = findvar(ahash, t_string);
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@@ -1482,7 +1489,7 @@ static void parse_program(char *p)
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if (next_token(TC_COMMA | TC_SEQTERM) & TC_SEQTERM)
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break;
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}
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- seq = &f->body;
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+ seq = &f->x.body;
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chain_group();
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clear_array(ahash);
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@@ -2580,7 +2587,8 @@ static var *evaluate(node *op, var *res)
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var *vbeg, *v;
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const char *sv_progname;
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- if (!op->r.f->body.first)
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+ if ((op->r.f->type == AWKFUNC) &&
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+ !op->r.f->x.body.first)
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syntax_error(EMSG_UNDEF_FUNC);
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vbeg = v = nvalloc(op->r.f->nargs + 1);
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@@ -2597,7 +2605,10 @@ static var *evaluate(node *op, var *res)
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fnargs = vbeg;
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sv_progname = g_progname;
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- res = evaluate(op->r.f->body.first, res);
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+ if (op->r.f->type == AWKFUNC)
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+ res = evaluate(op->r.f->x.body.first, res);
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+ else if (op->r.f->type == CFUNC)
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+ res = op->r.f->x.cfunc(res, fnargs, op->r.f->nargs);
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g_progname = sv_progname;
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nvfree(fnargs);
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@@ -2991,6 +3002,143 @@ static rstream *next_input_file(void)
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#undef files_happen
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}
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+/* read the contents of an entire file */
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+static char *get_file(const char *fname)
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+{
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+ FILE *F;
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+ char *s = NULL;
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+ int i, j, flen;
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+
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+ F = fopen(fname, "r");
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+ if (!F) {
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+ return NULL;
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+ }
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+
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+ if (fseek(F, 0, SEEK_END) == 0) {
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+ flen = ftell(F);
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+ s = (char *)xmalloc(flen+4);
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+ fseek(F, 0, SEEK_SET);
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+ i = 1 + fread(s+1, 1, flen, F);
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+ } else {
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+ for (i=j=1; j>0; i+=j) {
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+ s = (char *)xrealloc(s, i+4096);
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+ j = fread(s+i, 1, 4094, F);
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+ }
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+ }
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+
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+ s[i] = '\0';
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+ fclose(F);
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+ return s;
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+}
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+
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+
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+/* parse_include():
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+ *
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+ * taken from parse_program from awk.c
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+ * END{} is not parsed here, and BEGIN{} is executed immediately
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+ */
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+static void parse_include(char *p)
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+{
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+ uint32_t tclass;
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+ chain *initseq = NULL;
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+ chain tmp;
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+ func *f;
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+ var *v, *tv;
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+
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+ tv = nvalloc(1);
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+ memset(&tmp, 0, sizeof(tmp));
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+ g_pos = p;
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+ t_lineno = 1;
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+ while ((tclass = next_token(TC_EOF | TC_OPSEQ |
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+ TC_OPTERM | TC_BEGIN | TC_FUNCDECL)) != TC_EOF) {
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+ if (tclass & TC_OPTERM)
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+ continue;
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+
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+ seq = &tmp;
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+ if (tclass & TC_BEGIN) {
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+ initseq = xzalloc(sizeof(chain));
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+ seq = initseq;
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+ chain_group();
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+ } else if (tclass & TC_FUNCDECL) {
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+ next_token(TC_FUNCTION);
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+ g_pos++;
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+ f = newfunc(t_string);
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+ f->type = AWKFUNC;
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+ f->x.body.first = NULL;
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+ f->nargs = 0;
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+ while (next_token(TC_VARIABLE | TC_SEQTERM) & TC_VARIABLE) {
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+ v = findvar(ahash, t_string);
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+ v->x.aidx = (f->nargs)++;
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+
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+ if (next_token(TC_COMMA | TC_SEQTERM) & TC_SEQTERM)
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+ break;
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+ }
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+ seq = &(f->x.body);
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+ chain_group();
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+ clear_array(ahash);
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+ }
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+ }
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+ if (initseq && initseq->first)
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+ tv = evaluate(initseq->first, tv);
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+ nvfree(tv);
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+}
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+
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+
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+/* include an awk file and run its BEGIN{} section */
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+static xhash *includes = NULL;
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+static void include_file(const char *filename)
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+{
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+ char *s;
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+ var *v;
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+ int oldlnr = g_lineno;
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+ const char *oldprg = g_progname;
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+
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+ if (!includes)
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+ includes = hash_init();
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+
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+ /* find out if the file has been included already */
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+ v = findvar(includes, filename);
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+ if (istrue(v))
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+ return;
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+ setvar_s(v, "1");
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+
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+ /* read include file */
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+ s = get_file(filename);
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+ if (!s) {
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+ fprintf(stderr, "Could not open file.\n");
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+ return;
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+ }
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+ g_lineno = 1;
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+ g_progname = xstrdup(filename);
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+ parse_include(s+1);
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+ free(s);
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+ g_lineno = oldlnr;
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+ g_progname = oldprg;
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+}
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+
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+static var *include(var *res, var *args, int nargs)
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+{
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+ const char *s;
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+
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+ nargs = nargs; /* shut up, gcc */
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+ s = getvar_s(args);
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+ if (s && (strlen(s) > 0))
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+ include_file(s);
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+
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+ return res;
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+}
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+
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+/* registers a global c function for the awk interpreter */
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+static void register_cfunc(const char *name, awk_cfunc cfunc, int nargs)
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+{
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+ func *f;
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+
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+ f = newfunc(name);
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+ f->type = CFUNC;
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+ f->x.cfunc = cfunc;
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+ f->nargs = nargs;
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+}
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+
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int awk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int awk_main(int argc, char **argv)
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{
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@@ -3056,6 +3204,9 @@ int awk_main(int argc, char **argv)
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*s1 = '=';
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}
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}
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+
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+ register_cfunc("include", include, 1);
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+
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opt_complementary = "v::f::"; /* -v and -f can occur multiple times */
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opt = getopt32(argv, "F:v:f:W:", &opt_F, &list_v, &list_f, &opt_W);
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argv += optind;
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