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/*
* snprintf functions for CUPS.
*
* Copyright © 2021 by OpenPrinting
* Copyright © 2007-2019 by Apple Inc.
* Copyright © 1997-2007 by Easy Software Products.
*
* Licensed under Apache License v2.0. See the file "LICENSE" for more
* information.
*/
/*
* Include necessary headers...
*/
#include "string-private.h"
#ifndef HAVE_VSNPRINTF
/*
* '_cups_vsnprintf()' - Format a string into a fixed size buffer.
*/
int /* O - Number of bytes formatted */
_cups_vsnprintf(char *buffer, /* O - Output buffer */
size_t bufsize, /* O - Size of output buffer */
const char *format, /* I - printf-style format string */
va_list ap) /* I - Pointer to additional arguments */
{
char *bufptr, /* Pointer to position in buffer */
*bufend, /* Pointer to end of buffer */
sign, /* Sign of format width */
size, /* Size character (h, l, L) */
type; /* Format type character */
int width, /* Width of field */
prec; /* Number of characters of precision */
char tformat[100], /* Temporary format string for sprintf() */
*tptr, /* Pointer into temporary format */
temp[1024]; /* Buffer for formatted numbers */
size_t templen; /* Length of "temp" */
char *s; /* Pointer to string */
int slen; /* Length of string */
int bytes; /* Total number of bytes needed */
/*
* Loop through the format string, formatting as needed...
*/
bufptr = buffer;
bufend = buffer + bufsize - 1;
bytes = 0;
while (*format)
{
if (*format == '%')
{
tptr = tformat;
*tptr++ = *format++;
if (*format == '%')
{
if (bufptr && bufptr < bufend) *bufptr++ = *format;
bytes ++;
format ++;
continue;
}
else if (strchr(" -+#\'", *format))
{
*tptr++ = *format;
sign = *format++;
}
else
sign = 0;
if (*format == '*')
{
/*
* Get width from argument...
*/
format ++;
width = va_arg(ap, int);
/* Note: Can't use snprintf here since we are implementing this function... */
sprintf(tptr, "%d", width);
tptr += strlen(tptr);
}
else
{
width = 0;
while (isdigit(*format & 255))
{
if (tptr < (tformat + sizeof(tformat) - 1))
*tptr++ = *format;
width = width * 10 + *format++ - '0';
}
}
if (*format == '.')
{
if (tptr < (tformat + sizeof(tformat) - 1))
*tptr++ = *format;
format ++;
if (*format == '*')
{
/*
* Get precision from argument...
*/
format ++;
prec = va_arg(ap, int);
/* Note: Can't use snprintf here since we are implementing this function... */
sprintf(tptr, "%d", prec);
tptr += strlen(tptr);
}
else
{
prec = 0;
while (isdigit(*format & 255))
{
if (tptr < (tformat + sizeof(tformat) - 1))
*tptr++ = *format;
prec = prec * 10 + *format++ - '0';
}
}
}
else
prec = -1;
if (*format == 'l' && format[1] == 'l')
{
size = 'L';
if (tptr < (tformat + sizeof(tformat) - 2))
{
*tptr++ = 'l';
*tptr++ = 'l';
}
format += 2;
}
else if (*format == 'h' || *format == 'l' || *format == 'L')
{
if (tptr < (tformat + sizeof(tformat) - 1))
*tptr++ = *format;
size = *format++;
}
if (!*format)
break;
if (tptr < (tformat + sizeof(tformat) - 1))
*tptr++ = *format;
type = *format++;
*tptr = '\0';
switch (type)
{
case 'E' : /* Floating point formats */
case 'G' :
case 'e' :
case 'f' :
case 'g' :
if ((width + 2) > sizeof(temp))
break;
/* Note: Can't use snprintf here since we are implementing this function... */
sprintf(temp, tformat, va_arg(ap, double));
templen = strlen(temp);
bytes += (int)templen;
if (bufptr)
{
if ((bufptr + templen) > bufend)
{
strlcpy(bufptr, temp, (size_t)(bufend - bufptr));
bufptr = bufend;
}
else
{
memcpy(bufptr, temp, templen + 1);
bufptr += templen;
}
}
break;
case 'B' : /* Integer formats */
case 'X' :
case 'b' :
case 'd' :
case 'i' :
case 'o' :
case 'u' :
case 'x' :
if ((width + 2) > sizeof(temp))
break;
/* Note: Can't use snprintf here since we are implementing this function... */
sprintf(temp, tformat, va_arg(ap, int));
templen = strlen(temp);
bytes += (int)templen;
if (bufptr)
{
if ((bufptr + templen) > bufend)
{
strlcpy(bufptr, temp, (size_t)(bufend - bufptr));
bufptr = bufend;
}
else
{
memcpy(bufptr, temp, templen + 1);
bufptr += templen;
}
}
break;
case 'p' : /* Pointer value */
if ((width + 2) > sizeof(temp))
break;
/* Note: Can't use snprintf here since we are implementing this function... */
sprintf(temp, tformat, va_arg(ap, void *));
templen = strlen(temp);
bytes += (int)templen;
if (bufptr)
{
if ((bufptr + templen) > bufend)
{
strlcpy(bufptr, temp, (size_t)(bufend - bufptr));
bufptr = bufend;
}
else
{
memcpy(bufptr, temp, templen + 1);
bufptr += templen;
}
}
break;
case 'c' : /* Character or character array */
bytes += width;
if (bufptr)
{
if (width <= 1)
*bufptr++ = va_arg(ap, int);
else
{
if ((bufptr + width) > bufend)
width = (int)(bufend - bufptr);
memcpy(bufptr, va_arg(ap, char *), (size_t)width);
bufptr += width;
}
}
break;
case 's' : /* String */
if ((s = va_arg(ap, char *)) == NULL)
s = "(null)";
slen = (int)strlen(s);
if (slen > width && prec != width)
width = slen;
bytes += width;
if (bufptr)
{
if ((bufptr + width) > bufend)
width = (int)(bufend - bufptr);
if (slen > width)
slen = width;
if (sign == '-')
{
memcpy(bufptr, s, (size_t)slen);
memset(bufptr + slen, ' ', (size_t)(width - slen));
}
else
{
memset(bufptr, ' ', (size_t)(width - slen));
memcpy(bufptr + width - slen, s, (size_t)slen);
}
bufptr += width;
}
break;
case 'n' : /* Output number of chars so far */
*(va_arg(ap, int *)) = bytes;
break;
}
}
else
{
bytes ++;
if (bufptr && bufptr < bufend)
*bufptr++ = *format;
format ++;
}
}
/*
* Nul-terminate the string and return the number of characters needed.
*/
if (bufptr && bufptr < bufend)
*bufptr = '\0';
return (bytes);
}
#endif /* !HAVE_VSNPRINT */
#ifndef HAVE_SNPRINTF
/*
* '_cups_snprintf()' - Format a string into a fixed size buffer.
*/
int /* O - Number of bytes formatted */
_cups_snprintf(char *buffer, /* O - Output buffer */
size_t bufsize, /* O - Size of output buffer */
const char *format, /* I - printf-style format string */
...) /* I - Additional arguments as needed */
{
int bytes; /* Number of bytes formatted */
va_list ap; /* Pointer to additional arguments */
va_start(ap, format);
bytes = vsnprintf(buffer, bufsize, format, ap);
va_end(ap);
return (bytes);
}
#endif /* !HAVE_SNPRINTF */
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