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-rw-r--r--libc/stdio/Makefile2
-rw-r--r--libc/stdio/printf.c178
2 files changed, 104 insertions, 76 deletions
diff --git a/libc/stdio/Makefile b/libc/stdio/Makefile
index 3357b3a93..984af2106 100644
--- a/libc/stdio/Makefile
+++ b/libc/stdio/Makefile
@@ -13,7 +13,7 @@ AOBJ=_stdio_init.o fputc.o fgetc.o fflush.o fgets.o gets.o fputs.o \
setbuffer.o setvbuf.o ungetc.o
PSRC=printf.c
-POBJ=printf.o sprintf.o fprintf.o vprintf.o vsprintf.o vfprintf.o
+POBJ=printf.o sprintf.o fprintf.o vprintf.o vsprintf.o vfprintf.o snprintf.o vsnprintf.o
SSRC=scanf.c
SOBJ=scanf.o sscanf.o fscanf.o vscanf.o vsscanf.o vfscanf.o
diff --git a/libc/stdio/printf.c b/libc/stdio/printf.c
index 873f1cb41..7aba8c74d 100644
--- a/libc/stdio/printf.c
+++ b/libc/stdio/printf.c
@@ -32,98 +32,117 @@
#include "stdio.h"
-#ifdef L_printf
-#ifdef __STDC__
+
+extern int vfnprintf(FILE *op, size_t max_size, register __const char *fmt, register va_list ap);
+
+
+
+
+#ifdef L_printf
int printf(const char * fmt, ...)
-#else
-int printf(fmt, va_alist)
-__const char *fmt;
-va_dcl
-#endif
{
- va_list ptr;
- int rv;
+ va_list ptr;
+ int rv;
- va_strt(ptr, fmt);
- rv = vfprintf(stdout,fmt,ptr);
- va_end(ptr);
- return rv;
+ va_strt(ptr, fmt);
+ rv = vfnprintf(stdout, -1, fmt, ptr);
+ va_end(ptr);
+ return rv;
}
#endif
#ifdef L_sprintf
-#ifdef __STDC__
int sprintf(char * sp, const char * fmt, ...)
-#else
-int sprintf(sp, fmt, va_alist)
-char * sp;
-__const char *fmt;
-va_dcl
-#endif
{
-static FILE string[1] =
+ static FILE string[1] =
+ {
+ {0, 0, (char*)(unsigned) -1, 0, (char*) (unsigned) -1, -1,
+ _IOFBF | __MODE_WRITE}
+ };
+
+ va_list ptr;
+ int rv;
+ va_strt(ptr, fmt);
+ string->bufpos = sp;
+ rv = vfnprintf(string, -1, fmt, ptr);
+ va_end(ptr);
+ *(string->bufpos) = 0;
+ return rv;
+}
+#endif
+
+
+#ifdef L_snprintf
+int snprintf(char * sp, size_t size, const char * fmt, ...)
{
- {0, 0, (char*)(unsigned) -1, 0, (char*) (unsigned) -1, -1,
- _IOFBF | __MODE_WRITE}
-};
-
- va_list ptr;
- int rv;
- va_strt(ptr, fmt);
- string->bufpos = sp;
- rv = vfprintf(string,fmt,ptr);
- va_end(ptr);
- *(string->bufpos) = 0;
- return rv;
+ static FILE string[1] =
+ {
+ {0, 0, (char*)(unsigned) -1, 0, (char*) (unsigned) -1, -1,
+ _IOFBF | __MODE_WRITE}
+ };
+
+ va_list ptr;
+ int rv;
+ va_strt(ptr, fmt);
+ string->bufpos = sp;
+ rv = vfnprintf(string, size, fmt, ptr);
+ va_end(ptr);
+ *(string->bufpos) = 0;
+ return rv;
}
#endif
#ifdef L_fprintf
-#ifdef __STDC__
int fprintf(FILE * fp, const char * fmt, ...)
-#else
-int fprintf(fp, fmt, va_alist)
-FILE * fp;
-__const char *fmt;
-va_dcl
-#endif
{
- va_list ptr;
- int rv;
- va_strt(ptr, fmt);
- rv = vfprintf(fp,fmt,ptr);
- va_end(ptr);
- return rv;
+ va_list ptr;
+ int rv;
+ va_strt(ptr, fmt);
+ rv = vfnprintf(fp, -1, fmt, ptr);
+ va_end(ptr);
+ return rv;
}
#endif
#ifdef L_vprintf
-int vprintf(fmt, ap)
-__const char *fmt;
-va_list ap;
+int vprintf(const char * fmt, va_list ap)
{
- return vfprintf(stdout,fmt,ap);
+ return vfprintf(stdout,fmt,ap);
}
#endif
#ifdef L_vsprintf
-int vsprintf(sp, fmt, ap)
-char * sp;
-__const char *fmt;
-va_list ap;
+int vsprintf( char * sp, __const char *fmt, va_list ap)
{
-static FILE string[1] =
+ static FILE string[1] =
+ {
+ {0, 0, (char*)(unsigned) -1, 0, (char*) (unsigned) -1, -1,
+ _IOFBF | __MODE_WRITE}
+ };
+
+ int rv;
+ string->bufpos = sp;
+ rv = vfnprintf(string, -1, fmt, ap);
+ *(string->bufpos) = 0;
+ return rv;
+}
+#endif
+
+#ifdef L_vsprintf
+int vsnprintf( char * sp, size_t size, __const char *fmt, va_list ap)
{
- {0, 0, (char*)(unsigned) -1, 0, (char*) (unsigned) -1, -1,
- _IOFBF | __MODE_WRITE}
-};
-
- int rv;
- string->bufpos = sp;
- rv = vfprintf(string,fmt,ap);
- *(string->bufpos) = 0;
- return rv;
+ static FILE string[1] =
+ {
+ {0, 0, (char*)(unsigned) -1, 0, (char*) (unsigned) -1, -1,
+ _IOFBF | __MODE_WRITE}
+ };
+
+ int rv;
+ string->bufpos = sp;
+ rv = vfnprintf(string, size, fmt, ap);
+ *(string->bufpos) = 0;
+ return rv;
}
#endif
@@ -136,7 +155,7 @@ int _vfprintf_fp_ref = 0;
#endif
static int
-prtfld(op, buf, ljustf, sign, pad, width, preci, buffer_mode)
+printfield(op, buf, ljustf, sign, pad, width, preci, buffer_mode, max_size, current_size)
register FILE *op;
register unsigned char *buf;
int ljustf;
@@ -145,6 +164,8 @@ char pad;
register int width;
int preci;
int buffer_mode;
+size_t max_size;
+size_t current_size;
/*
* Output the given field in the manner specified by the arguments. Return
* the number of characters output.
@@ -198,18 +219,18 @@ int buffer_mode;
ch = pad; /* right padding */
--width;
}
- putc(ch, op);
+ current_size++;
+ if (max_size>0 && current_size < max_size)
+ putc(ch, op);
if( ch == '\n' && buffer_mode == _IOLBF ) fflush(op);
}
return (cnt);
}
-int
-vfprintf(op, fmt, ap)
-FILE *op;
-register __const char *fmt;
-register va_list ap;
+
+
+int vfnprintf(FILE *op, size_t max_size, register __const char *fmt, register va_list ap)
{
register int i, cnt = 0, ljustf, lval;
int preci, dpoint, width;
@@ -342,8 +363,8 @@ register va_list ap;
sign = '\0';
pad = ' ';
printit:
- cnt += prtfld(op, ptmp, ljustf,
- sign, pad, width, preci, buffer_mode);
+ cnt += printfield(op, ptmp, ljustf, sign, pad, width,
+ preci, buffer_mode, max_size, cnt);
break;
#if FLOATS
@@ -373,8 +394,8 @@ register va_list ap;
else
{
charout:
- putc(*fmt, op); /* normal char out */
- ++cnt;
+ if (max_size>0 && ++cnt<max_size)
+ putc(*fmt, op); /* normal char out */
if( *fmt == '\n' && buffer_mode == _IOLBF ) fflush(op);
}
++fmt;
@@ -384,4 +405,11 @@ register va_list ap;
if( buffer_mode == _IOLBF ) op->bufwrite = op->bufstart;
return (cnt);
}
+
+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 2024-11-05 09:41:58 +0000