зеркало из https://github.com/github/ruby.git
618 строки
12 KiB
C
618 строки
12 KiB
C
/**********************************************************************
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sprintf.c -
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$Author$
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$Date$
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created at: Fri Oct 15 10:39:26 JST 1993
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Copyright (C) 1993-2003 Yukihiro Matsumoto
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Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
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Copyright (C) 2000 Information-technology Promotion Agency, Japan
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**********************************************************************/
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#include "ruby.h"
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#include <ctype.h>
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#include <math.h>
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#define BIT_DIGITS(N) (((N)*146)/485 + 1) /* log2(10) =~ 146/485 */
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static void fmt_setup _((char*,int,int,int,int));
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static char*
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remove_sign_bits(str, base)
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char *str;
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int base;
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{
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char *s, *t, *end;
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unsigned long len;
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s = t = str;
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len = strlen(str);
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end = str + len;
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if (base == 16) {
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while (t<end && *t == 'f') {
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t++;
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}
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}
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else if (base == 8) {
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while (t<end && *t == '7') {
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t++;
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}
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}
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else if (base == 2) {
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while (t<end && *t == '1') {
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t++;
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}
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}
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while (*t) *s++ = *t++;
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*s = '\0';
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return str;
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}
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#define FNONE 0
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#define FSHARP 1
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#define FMINUS 2
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#define FPLUS 4
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#define FZERO 8
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#define FSPACE 16
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#define FWIDTH 32
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#define FPREC 64
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#define CHECK(l) do {\
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while (blen + (l) >= bsiz) {\
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bsiz*=2;\
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}\
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rb_str_resize(result, bsiz);\
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buf = RSTRING(result)->ptr;\
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} while (0)
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#define PUSH(s, l) do { \
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CHECK(l);\
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memcpy(&buf[blen], s, l);\
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blen += (l);\
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} while (0)
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#define GETARG() (nextvalue != Qundef ? nextvalue : \
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posarg < 0 ? \
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(rb_raise(rb_eArgError, "unnumbered(%d) mixed with numbered", nextarg), 0) : \
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(posarg = nextarg++, GETNTHARG(posarg)))
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#define GETPOSARG(n) (posarg > 0 ? \
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(rb_raise(rb_eArgError, "numbered(%d) after unnumbered(%d)", n, posarg), 0) : \
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((n < 1) ? (rb_raise(rb_eArgError, "invalid index - %d$", n), 0) : \
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(posarg = -1, GETNTHARG(n))))
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#define GETNTHARG(nth) \
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((nth >= argc) ? (rb_raise(rb_eArgError, "too few argument."), 0) : argv[nth])
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#define GETASTER(val) do { \
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t = p++; \
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n = 0; \
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for (; p < end && ISDIGIT(*p); p++) { \
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n = 10 * n + (*p - '0'); \
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} \
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if (p >= end) { \
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rb_raise(rb_eArgError, "malformed format string - %%*[0-9]"); \
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} \
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if (*p == '$') { \
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tmp = GETPOSARG(n); \
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} \
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else { \
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tmp = GETARG(); \
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p = t; \
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} \
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val = NUM2INT(tmp); \
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} while (0)
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VALUE
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rb_f_sprintf(argc, argv)
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int argc;
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VALUE *argv;
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{
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VALUE fmt;
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char *buf, *p, *end;
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int blen, bsiz;
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VALUE result;
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int width, prec, flags = FNONE;
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int nextarg = 1;
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int posarg = 0;
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int tainted = 0;
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VALUE nextvalue;
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VALUE tmp;
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VALUE str;
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fmt = GETNTHARG(0);
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if (OBJ_TAINTED(fmt)) tainted = 1;
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StringValue(fmt);
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p = RSTRING(fmt)->ptr;
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end = p + RSTRING(fmt)->len;
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blen = 0;
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bsiz = 120;
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result = rb_str_buf_new(bsiz);
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buf = RSTRING(result)->ptr;
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for (; p < end; p++) {
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char *t;
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int n;
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for (t = p; t < end && *t != '%'; t++) ;
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PUSH(p, t - p);
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if (t >= end) {
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/* end of fmt string */
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goto sprint_exit;
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}
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p = t + 1; /* skip `%' */
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width = prec = -1;
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nextvalue = Qundef;
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retry:
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switch (*p) {
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default:
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if (ISPRINT(*p))
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rb_raise(rb_eArgError, "malformed format string - %%%c", *p);
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else
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rb_raise(rb_eArgError, "malformed format string");
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break;
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case ' ':
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flags |= FSPACE;
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p++;
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goto retry;
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case '#':
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flags |= FSHARP;
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p++;
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goto retry;
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case '+':
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flags |= FPLUS;
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p++;
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goto retry;
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case '-':
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flags |= FMINUS;
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p++;
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goto retry;
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case '0':
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flags |= FZERO;
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p++;
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goto retry;
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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n = 0;
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for (; p < end && ISDIGIT(*p); p++) {
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n = 10 * n + (*p - '0');
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}
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if (p >= end) {
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rb_raise(rb_eArgError, "malformed format string - %%[0-9]");
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}
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if (*p == '$') {
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if (nextvalue != Qundef) {
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rb_raise(rb_eArgError, "value given twice - %d$", n);
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}
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nextvalue = GETPOSARG(n);
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p++;
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goto retry;
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}
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width = n;
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flags |= FWIDTH;
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goto retry;
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case '*':
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if (flags & FWIDTH) {
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rb_raise(rb_eArgError, "width given twice");
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}
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flags |= FWIDTH;
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GETASTER(width);
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if (width < 0) {
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flags |= FMINUS;
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width = -width;
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}
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p++;
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goto retry;
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case '.':
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if (flags & FPREC) {
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rb_raise(rb_eArgError, "precision given twice");
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}
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flags |= FPREC;
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prec = 0;
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p++;
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if (*p == '*') {
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GETASTER(prec);
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if (prec < 0) { /* ignore negative precision */
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flags &= ~FPREC;
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}
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p++;
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goto retry;
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}
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for (; p < end && ISDIGIT(*p); p++) {
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prec = 10 * prec + (*p - '0');
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}
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if (p >= end) {
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rb_raise(rb_eArgError, "malformed format string - %%.[0-9]");
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}
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goto retry;
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case '\n':
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p--;
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case '\0':
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case '%':
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if (flags != FNONE) {
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rb_raise(rb_eArgError, "illegal format character - %%");
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}
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PUSH("%", 1);
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break;
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case 'c':
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{
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VALUE val = GETARG();
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char c;
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if (!(flags & FMINUS))
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while (--width > 0)
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PUSH(" ", 1);
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c = NUM2INT(val) & 0xff;
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PUSH(&c, 1);
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while (--width > 0)
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PUSH(" ", 1);
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}
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break;
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case 's':
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{
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VALUE arg = GETARG();
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long len;
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str = rb_obj_as_string(arg);
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if (OBJ_TAINTED(str)) tainted = 1;
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len = RSTRING(str)->len;
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if (flags&FPREC) {
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if (prec < len) {
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len = prec;
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}
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}
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if (flags&FWIDTH) {
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if (width > len) {
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CHECK(width);
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width -= len;
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if (!(flags&FMINUS)) {
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while (width--) {
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buf[blen++] = ' ';
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}
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}
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memcpy(&buf[blen], RSTRING(str)->ptr, len);
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blen += len;
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if (flags&FMINUS) {
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while (width--) {
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buf[blen++] = ' ';
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}
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}
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break;
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}
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}
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PUSH(RSTRING(str)->ptr, len);
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}
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break;
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case 'd':
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case 'i':
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case 'o':
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case 'x':
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case 'X':
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case 'b':
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case 'B':
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case 'u':
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{
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volatile VALUE val = GETARG();
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char fbuf[32], nbuf[64], *s, *t;
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char *prefix = 0;
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int sign = 0;
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char sc = 0;
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long v;
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int base, bignum = 0;
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int len, pos;
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switch (*p) {
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case 'd':
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case 'i':
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sign = 1; break;
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case 'o':
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case 'x':
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case 'X':
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case 'b':
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case 'B':
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case 'u':
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default:
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if (flags&(FPLUS|FSPACE)) sign = 1;
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break;
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}
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if (flags & FSHARP) {
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if (*p == 'o') prefix = "0";
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else if (*p == 'x') prefix = "0x";
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else if (*p == 'X') prefix = "0X";
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else if (*p == 'b') prefix = "0b";
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else if (*p == 'B') prefix = "0B";
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if (prefix) {
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width -= strlen(prefix);
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}
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}
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bin_retry:
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switch (TYPE(val)) {
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case T_FLOAT:
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val = rb_dbl2big(RFLOAT(val)->value);
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if (FIXNUM_P(val)) goto bin_retry;
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bignum = 1;
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break;
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case T_STRING:
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val = rb_str_to_inum(val, 0, Qtrue);
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goto bin_retry;
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case T_BIGNUM:
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bignum = 1;
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break;
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case T_FIXNUM:
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v = FIX2LONG(val);
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break;
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default:
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val = rb_Integer(val);
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goto bin_retry;
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}
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if (*p == 'u' || *p == 'd' || *p == 'i') base = 10;
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else if (*p == 'x' || *p == 'X') base = 16;
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else if (*p == 'o') base = 8;
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else if (*p == 'b' || *p == 'B') base = 2;
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if (!bignum) {
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if (base == 2) {
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val = rb_int2big(v);
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goto bin_retry;
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}
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if (sign) {
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char c = *p;
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if (c == 'i') c = 'd'; /* %d and %i are identical */
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if (v < 0) {
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v = -v;
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sc = '-';
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width--;
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}
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else if (flags & FPLUS) {
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sc = '+';
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width--;
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}
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else if (flags & FSPACE) {
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sc = ' ';
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width--;
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}
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sprintf(fbuf, "%%l%c", c);
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sprintf(nbuf, fbuf, v);
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s = nbuf;
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goto format_integer;
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}
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s = nbuf;
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if (v < 0) {
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if (base == 10) {
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rb_warning("negative number for %%u specifier");
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}
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else if (!(flags&FPREC)) {
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strcpy(s, "..");
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s += 2;
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}
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}
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sprintf(fbuf, "%%l%c", *p);
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sprintf(s, fbuf, v);
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if (v < 0) {
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char d = 0;
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remove_sign_bits(s, base);
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switch (base) {
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case 16:
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d = 'f'; break;
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case 8:
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d = '7'; break;
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}
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if (d && *s != d) {
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memmove(s+1, s, strlen(s)+1);
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*s = d;
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}
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}
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s = nbuf;
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goto format_integer;
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}
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if (sign) {
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val = rb_big2str(val, base);
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s = RSTRING(val)->ptr;
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if (s[0] == '-') {
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s++;
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sc = '-';
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}
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else if (flags & FPLUS) {
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sc = '+';
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}
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else if (flags & FSPACE) {
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sc = ' ';
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}
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width--;
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goto format_integer;
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}
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if (!RBIGNUM(val)->sign) {
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val = rb_big_clone(val);
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rb_big_2comp(val);
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}
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val = rb_big2str(val, base);
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s = RSTRING(val)->ptr;
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if (*s == '-') {
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if (base == 10) {
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rb_warning("negative number for %%u specifier");
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s++;
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}
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else {
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remove_sign_bits(++s, base);
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val = rb_str_new(0, 3+strlen(s));
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t = RSTRING(val)->ptr;
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if (!(flags&FPREC)) {
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strcpy(t, "..");
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t += 2;
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}
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switch (base) {
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case 16:
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if (s[0] != 'f') strcpy(t++, "f"); break;
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case 8:
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if (s[0] != '7') strcpy(t++, "7"); break;
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case 2:
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if (s[0] != '1') strcpy(t++, "1"); break;
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}
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strcpy(t, s);
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bignum = 2;
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}
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}
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s = RSTRING(val)->ptr;
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format_integer:
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pos = -1;
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len = strlen(s);
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if (*p == 'X') {
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char *pp = s;
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while (*pp) {
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*pp = toupper(*pp);
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pp++;
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}
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}
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if ((flags&(FZERO|FPREC)) == FZERO) {
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prec = width;
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width = 0;
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}
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else {
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if (prec < len) prec = len;
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width -= prec;
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}
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if (!(flags&FMINUS)) {
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CHECK(width);
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while (width-- > 0) {
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buf[blen++] = ' ';
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}
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}
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if (sc) PUSH(&sc, 1);
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if (prefix) {
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int plen = strlen(prefix);
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PUSH(prefix, plen);
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}
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CHECK(prec - len);
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if (v < 0) {
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char c = '.';
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switch (base) {
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case 16:
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if (*p == 'X') c = 'F';
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else c = 'f';
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break;
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case 8:
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c = '7'; break;
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case 2:
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c = '1'; break;
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}
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while (len < prec--) {
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buf[blen++] = c;
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}
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}
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else {
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while (len < prec--) {
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buf[blen++] = '0';
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}
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}
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PUSH(s, len);
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CHECK(width);
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while (width-- > 0) {
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buf[blen++] = ' ';
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}
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}
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break;
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case 'f':
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case 'g':
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case 'G':
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case 'e':
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case 'E':
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{
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VALUE val = GETARG();
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double fval;
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int i, need = 6;
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char fbuf[32];
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fval = RFLOAT(rb_Float(val))->value;
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fmt_setup(fbuf, *p, flags, width, prec);
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need = 0;
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if (*p != 'e' && *p != 'E') {
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i = INT_MIN;
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frexp(fval, &i);
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if (i > 0)
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need = BIT_DIGITS(i);
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}
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need += (flags&FPREC) ? prec : 6;
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if ((flags&FWIDTH) && need < width)
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need = width;
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need += 20;
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CHECK(need);
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sprintf(&buf[blen], fbuf, fval);
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blen += strlen(&buf[blen]);
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}
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break;
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}
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flags = FNONE;
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}
|
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|
|
sprint_exit:
|
|
#if 0
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|
/* XXX - We cannot validiate the number of arguments because
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|
* the format string may contain `n$'-style argument selector.
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*/
|
|
if (RTEST(ruby_verbose) && nextarg < argc) {
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|
rb_raise(rb_eArgError, "too many argument for format string");
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}
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|
#endif
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|
rb_str_resize(result, blen);
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|
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if (tainted) OBJ_TAINT(result);
|
|
return result;
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|
}
|
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|
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static void
|
|
fmt_setup(buf, c, flags, width, prec)
|
|
char *buf;
|
|
int c;
|
|
int flags, width, prec;
|
|
{
|
|
*buf++ = '%';
|
|
if (flags & FSHARP) *buf++ = '#';
|
|
if (flags & FPLUS) *buf++ = '+';
|
|
if (flags & FMINUS) *buf++ = '-';
|
|
if (flags & FZERO) *buf++ = '0';
|
|
if (flags & FSPACE) *buf++ = ' ';
|
|
|
|
if (flags & FWIDTH) {
|
|
sprintf(buf, "%d", width);
|
|
buf += strlen(buf);
|
|
}
|
|
|
|
if (flags & FPREC) {
|
|
sprintf(buf, ".%d", prec);
|
|
buf += strlen(buf);
|
|
}
|
|
|
|
*buf++ = c;
|
|
*buf = '\0';
|
|
}
|