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-rw-r--r--libc/stdio/printf.c116
1 files changed, 62 insertions, 54 deletions
diff --git a/libc/stdio/printf.c b/libc/stdio/printf.c
index 8d62278ff..0fa7cd038 100644
--- a/libc/stdio/printf.c
+++ b/libc/stdio/printf.c
@@ -60,12 +60,14 @@
* Manuel Novoa III Jan 2000
*
* Removed fake file from *s*printf functions because of possible problems
- * if called recursively. Instead, have sprintf, snprintf, and vsprintf
- * call vsnprintf which allocates a fake file on the stack.
- *
+ * if called recursively. Instead, have sprintf, snprintf, and vsprintf
+ * call vsnprintf which allocates a fake file on the stack.
+ * Removed WANT_FPUTC option. Always use standard putc macro to avoid
+ * problems with the fake file used by the *s*printf functions.
* Added asprintf.
- *
- * Hopefully fixed 0-pad prefixing bug.
+ * Fixed 0-pad prefixing bug.
+ * Converted sizeof(int) == sizeof(long) tests to compile time vs run time.
+ * This saves 112 bytes of code on i386.
*/
/*****************************************************************************/
@@ -74,8 +76,8 @@
/* The optional support for long longs and doubles comes in two forms.
*
* 1) Normal (or partial for doubles) output support. Set to 1 to turn on.
- * Adds about 54 byes and about 217 bytes for long longss to the base size
- * of 1298. (Bizarre: both turned on is smaller than WANT_LONG_LONG only.)
+ * Adds about 70 bytes for doubles, about 220 bytes for long longs,
+ * and about 275 for both to the base code size of 1163 on i386.
*/
#define WANT_LONG_LONG 0
@@ -84,8 +86,9 @@
/* 2) An error message is inserted into the stream, an arg of the
* appropriate size is removed from the arglist, and processing
* continues. This is adds less code and may be useful in some
- * cases. Set to 1 to turn on. Adds about 31 bytes for doubles
- * and about 54 bytes for long longs to the base size of 1298.
+ * cases. Set to 1 to turn on. Adds about 50 bytes for doubles,
+ * about 140 bytes for long longs, and about 175 bytes for both
+ * to the base code size of 1163 on i386.
*/
#define WANT_LONG_LONG_ERROR 0
@@ -100,20 +103,13 @@
#define WANT_GNU_ERRNO 0
-/*
- * Use fputc instead of macro putc. Slower but saves about 36 bytes.
- * WARNING! This may cause problems the the *s*printf functions!
- * Don't enable at this time. Manuel
- */
-
-#define WANT_FPUTC 0
-
/**************************************************************************/
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
+#include <limits.h>
#if WANT_GNU_ERRNO
#include <errno.h>
@@ -129,12 +125,6 @@
#include "stdio.h"
-#if WANT_FPUTC
-#undef putc
-#define putc(c,s) fputc(c,s)
-#endif
-
-
extern int vfnprintf(FILE * op, size_t max_size,
register __const char *fmt, register va_list ap);
@@ -226,6 +216,15 @@ int vprintf(const char *fmt, va_list ap)
}
#endif
+#ifdef L_vfprintf
+
+int vfprintf(FILE * op, register __const char *fmt, register va_list ap)
+{
+ return (vfnprintf(op, -1, fmt, ap));
+}
+
+#endif
+
#ifdef L_vsprintf
int vsprintf(char *sp, __const char *fmt, va_list ap)
{
@@ -334,7 +333,11 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap)
preci = -5; /* max string width or mininum digits */
radix = 10; /* number base */
dpoint = 0; /* found decimal point */
- lval = (sizeof(int) == sizeof(long)); /* long value flaged */
+#if INT_MAX != LONG_MAX
+ lval = 0; /* sizeof(int) != sizeof(long) */
+#else
+ lval = 1; /* sizeof(int) == sizeof(long) */
+#endif
tmp[1] = 0; /* set things up for %c -- better done here */
@@ -345,10 +348,12 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap)
flag[FLAG_0_PAD] = ' ';
/* process optional flags */
- for (p = (char *)spec ; *p ; p++) {
+ for (p = (char *)spec ; *p ; ) {
if (*fmt == *p) {
flag[p-spec] = *fmt++;
p = (char *)spec; /* restart scan */
+ } else {
+ p++;
}
}
@@ -437,28 +442,35 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap)
#endif /* WANT_LONG_LONG */
} else {
#endif /* WANT_LONG_LONG || WANT_LONG_LONG_ERROR */
+#if UINT_MAX != ULONG_MAX
+ /* sizeof(unsigned int) != sizeof(unsigned long) */
p = __ultostr(tmp + sizeof(tmp) - 1, (unsigned long)
((lval)
? va_arg(ap, unsigned long)
: va_arg(ap, unsigned int)),
radix, upcase);
+#else
+ /* sizeof(unsigned int) == sizeof(unsigned long) */
+ p = __ultostr(tmp + sizeof(tmp) - 1, (unsigned long)
+ va_arg(ap, unsigned long),
+ radix, upcase);
+#endif
#if WANT_LONG_LONG || WANT_LONG_LONG_ERROR
}
#endif /* WANT_LONG_LONG || WANT_LONG_LONG_ERROR */
flag[FLAG_PLUS] = '\0'; /* meaningless for unsigned */
- if (flag[FLAG_HASH]) {
- switch (radix) {
- case 16:
- flag[FLAG_PLUS] = '0';
- *--p = 'x';
+ if (flag[FLAG_HASH] && (*p != '0')) { /* non-zero */
+ if (radix == 8) {
+ *--p = '0'; /* add leadding zero */
+ } else { /* either 2 or 16 */
+ flag[FLAG_PLUS] = '0';
+ *--p = 'b';
+ if (radix == 16) {
+ *p = 'x';
if (*fmt == 'X') {
*p = 'X';
}
- break;
- case 8:
- if (*p != '0') { /* if not zero */
- *--p = '0'; /* add leadding zero */
- }
+ }
}
}
} else if (p-u_spec < 10) { /* signed conversion */
@@ -473,10 +485,17 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap)
#endif /* WANT_LONG_LONG */
} else {
#endif /* WANT_LONG_LONG || WANT_LONG_LONG_ERROR */
+#if INT_MAX != LONG_MAX
+ /* sizeof(int) != sizeof(long) */
p = __ltostr(tmp + sizeof(tmp) - 1, (long)
((lval)
? va_arg(ap, long)
: va_arg(ap, int)), 10, 0);
+#else
+ /* sizeof(int) == sizeof(long) */
+ p = __ltostr(tmp + sizeof(tmp) - 1, (long)
+ va_arg(ap, long), 10, 0);
+#endif
#if WANT_LONG_LONG || WANT_LONG_LONG_ERROR
}
#endif /* WANT_LONG_LONG || WANT_LONG_LONG_ERROR */
@@ -547,8 +566,8 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap)
if (preci < 0) {
preci = 0;
- if (flag[FLAG_PLUS]
- && !flag[FLAG_MINUS_LJUSTIFY]
+ if (!flag[FLAG_MINUS_LJUSTIFY]
+ /* && flag[FLAG_PLUS] */
&& (flag[FLAG_0_PAD] == '0')) {
preci = width;
width = 0;
@@ -560,7 +579,7 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap)
/* right padding || left padding */
if ((!len && !preci)
|| (width && !flag[FLAG_MINUS_LJUSTIFY])) {
- ch = flag[FLAG_0_PAD];
+ ch = ' ';
--width;
} else if (flag[FLAG_PLUS]) {
ch = flag[FLAG_PLUS]; /* sign */
@@ -570,15 +589,12 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap)
flag[FLAG_PLUS] = '\0';
}
--len;
+ } else if (preci) {
+ ch = '0';
+ --preci;
} else {
- flag[FLAG_0_PAD]=' ';
- if (preci) {
- ch = '0';
- --preci;
- } else {
- ch = *p++; /* main field */
- --len;
- }
+ ch = *p++; /* main field */
+ --len;
}
if (++cnt < max_size) {
@@ -623,11 +639,3 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap)
#endif
-#ifdef L_vfprintf
-
-int vfprintf(FILE * op, register __const char *fmt, register va_list ap)
-{
- return (vfnprintf(op, -1, fmt, ap));
-}
-
-#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-29 05:11:24 +0000