libcdecl: Explicitly declare most scanner functions static.

[cdecl99.git] / src / scan.l

diff --git a/src/scan.l b/src/scan.l
index fbe80b2fddae12cc5076a9a0e108497d0b28d7ff..73efdde88126075253484ca3d3c760a6959c7019 100644 (file)
--- a/src/scan.l
+++ b/src/scan.l
@@ -1,7 +1,7 @@
 %top{
 /*
  *  Scanner for C declarations.
- *  Copyright © 2011, 2021, 2023 Nick Bowler
+ *  Copyright © 2011, 2021, 2023-2024 Nick Bowler
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -18,10 +18,54 @@
  */
 
 #include <config.h>
+#include <stdio.h>
 #include "parse.h"
 
+/* Disable various generated code we don't use */
+#define YY_INPUT(a, b, c) do {} while (0)
 #define YY_NO_INPUT 1
 #define YY_NO_UNPUT 1
+
+/*
+ * The flex-generated scanner defines a huge pile of external functions of
+ * which we use almost none elsewhere.  Explicitly declare any unneeded
+ * functions static, which allows better optimization (especially wrt.
+ * dead code elimination).
+ */
+static struct yy_buffer_state *cdecl__yy_create_buffer(FILE *, int, void *);
+static struct yy_buffer_state *cdecl__yy_scan_bytes(const char *, int, void *);
+static struct yy_buffer_state *cdecl__yy_scan_buffer(char *, size_t, void *);
+static void cdecl__yy_switch_to_buffer(struct yy_buffer_state *, void *);
+static void cdecl__yy_flush_buffer(struct yy_buffer_state *, void *);
+static void yypush_buffer_state(struct yy_buffer_state *, void *);
+static void cdecl__yypop_buffer_state(void *);
+static void cdecl__yyrestart(FILE *, void *);
+static int cdecl__yylex_init(void **);
+
+static int cdecl__yyget_extra(void *);
+static YYLTYPE *cdecl__yyget_lloc(void *);
+static YYSTYPE *cdecl__yyget_lval(void *);
+static char *cdecl__yyget_text(void *);
+static FILE *cdecl__yyget_out(void *);
+static FILE *cdecl__yyget_in(void *);
+static int cdecl__yyget_debug(void *);
+static int cdecl__yyget_lineno(void *);
+static int cdecl__yyget_column(void *);
+static int cdecl__yyget_leng(void *);
+
+static void cdecl__yyset_extra(int, void *);
+static void cdecl__yyset_lloc(YYLTYPE *, void *);
+static void cdecl__yyset_lval(YYSTYPE *, void *);
+static void cdecl__yyset_in(FILE *, void *);
+static void cdecl__yyset_out(FILE *, void *);
+static void cdecl__yyset_debug(int, void *);
+static void cdecl__yyset_lineno(int, void *);
+static void cdecl__yyset_column(int, void *);
+static void cdecl__yyset_leng(int, void *);
+
+static void *cdecl__yyrealloc(void *, size_t, void *);
+static void *cdecl__yyalloc(size_t, void *);
+static void cdecl__yyfree(void *, void *);
 }
 
 %option nodefault noyywrap bison-locations reentrant never-interactive
@@ -33,20 +77,7 @@
 #include "cdecl-internal.h"
 #include "cdecl.h"
 #include "errmsg.h"
-
-#if HAVE_STRTOUMAX
-/* Best case, implementation provides strtoumax. */
-#  define STRTOUMAX strtoumax
-#elif HAVE_STRTOULL
-/* Fall back to strtoull, with possibly reduced range. */
-#define STRTOUMAX strtoull
-#elif HAVE___STRTOULL
-/* HP-UX 11 has __strtoull in <inttypes.h> */
-#define STRTOUMAX __strtoull
-#else
-/* Fall back to strtoul, with possibly reduced range. */
-#define STRTOUMAX strtoul
-#endif
+#include "intconv.h"
 
 static char *to_octal(char *dst, unsigned val)
 {
@@ -111,11 +142,11 @@ static void to_readable_ch(char *dst, char c)
 %}
 
 IDENT [_[:alpha:]][-_[:alnum:]]*
-INTEGER 0[Xx][[:xdigit:]]*|[[:digit:]]+
 
 %%
 
 %{
+       int intconv_base;
        char *c;
 %}
 
@@ -139,22 +170,29 @@ INTEGER 0[Xx][[:xdigit:]]*|[[:digit:]]+
        return UNPACK_TOKEN(match[sizeof tab[0]]);
 }
 
-{INTEGER} {
-       char *end;
-
-       errno = 0;
-       yylval->uintval = STRTOUMAX(yytext, &end, 0);
-       if (errno == ERANGE) {
-               cdecl__errmsg(CDECL__ERANGE);
-               return T_LEX_ERROR;
-       }
-       if (*end) {
-               cdecl__errmsg(CDECL__EBADINT);
-               return T_LEX_ERROR;
+0[0-7]* { intconv_base = INTCONV_OCTAL; goto int_parse; }
+[1-9][0-9]* { intconv_base = INTCONV_DECIMAL; goto int_parse; }
+0[Xx][[:xdigit:]]+ {
+       unsigned char d;
+       uintmax_t v;
+
+       yytext += 2;
+       intconv_base = INTCONV_HEXADECIMAL;
+int_parse:
+       for (v = 0; (d = *yytext++);) {
+               if (!intconv_shift(&v, intconv_base, intconv_digit(d))) {
+                       cdecl__errmsg(CDECL__ERANGE);
+                       return T_LEX_ERROR;
+               }
        }
 
+       yylval->uintval = v;
        return T_UINT;
 }
+0[Xx]|[0-9]+ {
+       cdecl__errmsg(CDECL__EBADINT);
+       return T_LEX_ERROR;
+}
 
 {IDENT} {
        int len = yyleng, tok;
@@ -180,7 +218,7 @@ INTEGER 0[Xx][[:xdigit:]]*|[[:digit:]]+
                yyless(strcspn(yytext, "-"));
 #endif
                if (!(yylval->item = cdecl__alloc_item(len+1)))
-                       return T_LEX_ERROR; \
+                       return T_LEX_ERROR;
                memcpy(yylval->item->s, yytext, len+1);
        }
        return UNPACK_TOKEN(tok);