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/* $OpenBSD: safe_sprintf.c,v 1.1 1997/12/03 05:21:43 millert Exp $ */
/******************************************************************************
* Copyright 1997 by Thomas E. Dickey <dickey@clark.net> *
* All Rights Reserved. *
* *
* Permission to use, copy, modify, and distribute this software and its *
* documentation for any purpose and without fee is hereby granted, provided *
* that the above copyright notice appear in all copies and that both that *
* copyright notice and this permission notice appear in supporting *
* documentation, and that the name of the above listed copyright holder(s) *
* not be used in advertising or publicity pertaining to distribution of the *
* software without specific, written prior permission. *
* *
* THE ABOVE LISTED COPYRIGHT HOLDER(S) DISCLAIM ALL WARRANTIES WITH REGARD *
* TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND *
* FITNESS, IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE *
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR *
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
******************************************************************************/
#include <curses.priv.h>
#include <ctype.h>
MODULE_ID("Id: safe_sprintf.c,v 1.4 1997/11/01 23:01:09 tom Exp $")
#if USE_SAFE_SPRINTF
typedef enum { Flags, Width, Prec, Type, Format } PRINTF;
#define VA_INTGR(type) ival = va_arg(ap, type)
#define VA_FLOAT(type) fval = va_arg(ap, type)
#define VA_POINT(type) pval = (void *)va_arg(ap, type)
/*
* Scan a variable-argument list for printf to determine the number of
* characters that would be emitted.
*/
static int
_nc_printf_length(const char *fmt, va_list ap)
{
size_t length = BUFSIZ;
char *buffer;
char *format;
int len = 0;
if (fmt == 0 || *fmt == '\0')
return -1;
if ((format = malloc(strlen(fmt)+1)) == 0)
return -1;
if ((buffer = malloc(length)) == 0) {
free(format);
return -1;
}
while (*fmt != '\0') {
if (*fmt == '%') {
PRINTF state = Flags;
char *pval = "";
double fval = 0.0;
int done = FALSE;
int ival = 0;
int prec = -1;
int type = 0;
int used = 0;
int width = -1;
size_t f = 0;
format[f++] = *fmt;
while (*++fmt != '\0' && len >= 0 && !done) {
format[f++] = *fmt;
if (isdigit(*fmt)) {
int num = *fmt - '0';
if (state == Flags && num != 0)
state = Width;
if (state == Width) {
if (width < 0)
width = 0;
width = (width * 10) + num;
} else if (state == Prec) {
if (prec < 0)
prec = 0;
prec = (prec * 10) + num;
}
} else if (*fmt == '*') {
VA_INTGR(int);
if (state == Flags)
state = Width;
if (state == Width) {
width = ival;
} else if (state == Prec) {
prec = ival;
}
sprintf(&format[--f], "%d", ival);
f = strlen(format);
} else if (isalpha(*fmt)) {
done = TRUE;
switch (*fmt) {
case 'Z': /* FALLTHRU */
case 'h': /* FALLTHRU */
case 'l': /* FALLTHRU */
case 'L': /* FALLTHRU */
done = FALSE;
type = *fmt;
break;
case 'i': /* FALLTHRU */
case 'd': /* FALLTHRU */
case 'u': /* FALLTHRU */
case 'x': /* FALLTHRU */
case 'X': /* FALLTHRU */
if (type == 'l')
VA_INTGR(long);
else if (type == 'Z')
VA_INTGR(size_t);
else
VA_INTGR(int);
used = 'i';
break;
case 'f': /* FALLTHRU */
case 'e': /* FALLTHRU */
case 'E': /* FALLTHRU */
case 'g': /* FALLTHRU */
case 'G': /* FALLTHRU */
if (type == 'L')
VA_FLOAT(long double);
else
VA_FLOAT(double);
used = 'f';
break;
case 'c':
VA_INTGR(int);
used = 'i';
break;
case 's':
VA_POINT(char *);
if (prec < 0)
prec = strlen(pval);
if (prec > (int)length) {
length = length + prec;
buffer = realloc(buffer, length);
if (buffer == 0) {
free(format);
return -1;
}
}
used = 'p';
break;
case 'p':
VA_POINT(void *);
used = 'p';
break;
case 'n':
VA_POINT(int *);
used = 0;
break;
default:
break;
}
} else if (*fmt == '.') {
state = Prec;
} else if (*fmt == '%') {
done = TRUE;
used = 'p';
}
}
format[f] = '\0';
switch (used) {
case 'i':
sprintf(buffer, format, ival);
break;
case 'f':
sprintf(buffer, format, fval);
break;
default:
sprintf(buffer, format, pval);
break;
}
len += (int)strlen(buffer);
} else {
fmt++;
len++;
}
}
free(buffer);
free(format);
return len;
}
#endif
/*
* Wrapper for vsprintf that allocates a buffer big enough to hold the result.
*/
char *
_nc_printf_string(const char *fmt, va_list ap)
{
#if USE_SAFE_SPRINTF
char *buf = 0;
int len = _nc_printf_length(fmt, ap);
if (len > 0) {
buf = malloc(len+1);
vsprintf(buf, fmt, ap);
}
#else
static int rows, cols;
static char *buf;
static size_t len;
if (screen_lines > rows || screen_columns > cols) {
if (screen_lines > rows) rows = screen_lines;
if (screen_columns > cols) cols = screen_columns;
len = (rows * (cols + 1)) + 1;
if (buf == 0)
buf = malloc(len);
else
buf = realloc(buf, len);
}
if (buf != 0) {
# if HAVE_VSNPRINTF
vsnprintf(buf, len, fmt, ap); /* GNU extension */
# else
vsprintf(buf, fmt, ap); /* ANSI */
# endif
#endif
}
return buf;
}
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