Add project skeletonHEADmaster

1 files changed, 89 insertions, 0 deletions

diff --git a/im.c b/im.c
new file mode 100644
index 0000000..e1fd761
--- /dev/null
+++ b/im.c
@@ -0,0 +1,89 @@
+#include "im.h"
+#include "errloc.h"
+#include "fn.h"
+#include "prv.h"
+#include "parse.h"
+#include <errno.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void im_free(struct im *im)
+{
+    ast_free(&im->ast);
+    lex_free(&im->l);
+}
+
+static int doim(const struct lex *l, const struct tk *tk, struct prv *p)
+{
+    int ret = -1;
+    FILE *f = NULL;
+    struct im *im;
+    struct fn *fn = fn_cur(p);
+    struct ast *ast;
+    size_t n = fn->nimps + 1;
+    const char *path = tk->s;
+
+    if (!strcmp(l->loc.f, path))
+    {
+        errloc(tk, "detected recursive import \"%s\"", path);
+        goto end;
+    }
+    /* TODO: honor -I flags */
+    if (!(f = fopen(path, "rb")))
+    {
+        errloc(tk, "could not find import: \"%s\"", path);
+        goto end;
+    }
+    else if (!(im = realloc(fn->imps, n * sizeof *im)))
+    {
+        perror("realloc(3)");
+        goto end;
+    }
+
+    fn->imps = im;
+    im = &fn->imps[fn->nimps++];
+    *im = (struct im){.l.loc.f = path};
+    ast = &im->ast;
+
+    if (!(ast->fns = malloc(sizeof *ast->fns)))
+    {
+        perror("malloc(3)");
+        goto end;
+    }
+
+    *ast->fns = (struct fn){.tk = tk};
+    /* hack: treat imports as a function */
+    ast->nfns = 1;
+
+    if (lex(&im->l, f) || parse_im(&im->l, ast))
+        goto end;
+
+    ret = 0;
+
+end:
+
+    if (f && fclose(f))
+    {
+        fprintf(stderr, "fclose(3) %s: %s\n", path, strerror(errno));
+        ret = -1;
+    }
+
+    return ret;
+}
+
+int im(const struct lex *l, struct prv *p)
+{
+    const struct tk *tk = p->stk + 1;
+    struct pos *pos = &p->pos[p->i];
+
+    while (!lex_eof(l, tk) && !kw(tk->s))
+        if (doim(l, tk++, p))
+            return -1;
+
+    pos->seq = pos->stseq;
+    pos->step = pos->seq->steps;
+    p->stk = p->tk;
+    return 1;
+}