1 files changed, 423 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/core/vsprintf.c b/contrib/syslinux-4.02/gpxe/src/core/vsprintf.c
new file mode 100644
index 0000000..21ab242
--- /dev/null
+++ b/contrib/syslinux-4.02/gpxe/src/core/vsprintf.c
@@ -0,0 +1,423 @@
+/*
+ * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stddef.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <console.h>
+#include <errno.h>
+#include <gpxe/vsprintf.h>
+
+/** @file */
+
+#define CHAR_LEN	0	/**< "hh" length modifier */
+#define SHORT_LEN	1	/**< "h" length modifier */
+#define INT_LEN		2	/**< no length modifier */
+#define LONG_LEN	3	/**< "l" length modifier */
+#define LONGLONG_LEN	4	/**< "ll" length modifier */
+#define SIZE_T_LEN	5	/**< "z" length modifier */
+
+static uint8_t type_sizes[] = {
+	[CHAR_LEN]	= sizeof ( char ),
+	[SHORT_LEN]	= sizeof ( short ),
+	[INT_LEN]	= sizeof ( int ),
+	[LONG_LEN]	= sizeof ( long ),
+	[LONGLONG_LEN]	= sizeof ( long long ),
+	[SIZE_T_LEN]	= sizeof ( size_t ),
+};
+
+/**
+ * Use lower-case for hexadecimal digits
+ *
+ * Note that this value is set to 0x20 since that makes for very
+ * efficient calculations.  (Bitwise-ORing with @c LCASE converts to a
+ * lower-case character, for example.)
+ */
+#define LCASE 0x20
+
+/**
+ * Use "alternate form"
+ *
+ * For hexadecimal numbers, this means to add a "0x" or "0X" prefix to
+ * the number.
+ */
+#define ALT_FORM 0x02
+
+/**
+ * Format a hexadecimal number
+ *
+ * @v end		End of buffer to contain number
+ * @v num		Number to format
+ * @v width		Minimum field width
+ * @ret ptr		End of buffer
+ *
+ * Fills a buffer in reverse order with a formatted hexadecimal
+ * number.  The number will be zero-padded to the specified width.
+ * Lower-case and "alternate form" (i.e. "0x" prefix) flags may be
+ * set.
+ *
+ * There must be enough space in the buffer to contain the largest
+ * number that this function can format.
+ */
+static char * format_hex ( char *end, unsigned long long num, int width,
+			   int flags ) {
+	char *ptr = end;
+	int case_mod;
+
+	/* Generate the number */
+	case_mod = flags & LCASE;
+	do {
+		*(--ptr) = "0123456789ABCDEF"[ num & 0xf ] | case_mod;
+		num >>= 4;
+	} while ( num );
+
+	/* Zero-pad to width */
+	while ( ( end - ptr ) < width )
+		*(--ptr) = '0';
+
+	/* Add "0x" or "0X" if alternate form specified */
+	if ( flags & ALT_FORM ) {
+		*(--ptr) = 'X' | case_mod;
+		*(--ptr) = '0';
+	}
+
+	return ptr;
+}
+
+/**
+ * Format a decimal number
+ *
+ * @v end		End of buffer to contain number
+ * @v num		Number to format
+ * @v width		Minimum field width
+ * @ret ptr		End of buffer
+ *
+ * Fills a buffer in reverse order with a formatted decimal number.
+ * The number will be space-padded to the specified width.
+ *
+ * There must be enough space in the buffer to contain the largest
+ * number that this function can format.
+ */
+static char * format_decimal ( char *end, signed long num, int width ) {
+	char *ptr = end;
+	int negative = 0;
+
+	/* Generate the number */
+	if ( num < 0 ) {
+		negative = 1;
+		num = -num;
+	}
+	do {
+		*(--ptr) = '0' + ( num % 10 );
+		num /= 10;
+	} while ( num );
+
+	/* Add "-" if necessary */
+	if ( negative )
+		*(--ptr) = '-';
+
+	/* Space-pad to width */
+	while ( ( end - ptr ) < width )
+		*(--ptr) = ' ';
+
+	return ptr;
+}
+
+/**
+ * Print character via a printf context
+ *
+ * @v ctx		Context
+ * @v c			Character
+ *
+ * Call's the printf_context::handler() method and increments
+ * printf_context::len.
+ */
+static inline void cputchar ( struct printf_context *ctx, unsigned int c ) {
+	ctx->handler ( ctx, c );
+	++ctx->len;
+}
+
+/**
+ * Write a formatted string to a printf context
+ *
+ * @v ctx		Context
+ * @v fmt		Format string
+ * @v args		Arguments corresponding to the format string
+ * @ret len		Length of formatted string
+ */
+size_t vcprintf ( struct printf_context *ctx, const char *fmt, va_list args ) {
+	int flags;
+	int width;
+	uint8_t *length;
+	char *ptr;
+	char tmp_buf[32]; /* 32 is enough for all numerical formats.
+			   * Insane width fields could overflow this buffer. */
+
+	/* Initialise context */
+	ctx->len = 0;
+
+	for ( ; *fmt ; fmt++ ) {
+		/* Pass through ordinary characters */
+		if ( *fmt != '%' ) {
+			cputchar ( ctx, *fmt );
+			continue;
+		}
+		fmt++;
+		/* Process flag characters */
+		flags = 0;
+		for ( ; ; fmt++ ) {
+			if ( *fmt == '#' ) {
+				flags |= ALT_FORM;
+			} else if ( *fmt == '0' ) {
+				/* We always 0-pad hex and space-pad decimal */
+			} else {
+				/* End of flag characters */
+				break;
+			}
+		}
+		/* Process field width */
+		width = 0;
+		for ( ; ; fmt++ ) {
+			if ( ( ( unsigned ) ( *fmt - '0' ) ) < 10 ) {
+				width = ( width * 10 ) + ( *fmt - '0' );
+			} else {
+				break;
+			}
+		}
+		/* We don't do floating point */
+		/* Process length modifier */
+		length = &type_sizes[INT_LEN];
+		for ( ; ; fmt++ ) {
+			if ( *fmt == 'h' ) {
+				length--;
+			} else if ( *fmt == 'l' ) {
+				length++;
+			} else if ( *fmt == 'z' ) {
+				length = &type_sizes[SIZE_T_LEN];
+			} else {
+				break;
+			}
+		}
+		/* Process conversion specifier */
+		ptr = tmp_buf + sizeof ( tmp_buf ) - 1;
+		*ptr = '\0';
+		if ( *fmt == 'c' ) {
+			cputchar ( ctx, va_arg ( args, unsigned int ) );
+		} else if ( *fmt == 's' ) {
+			ptr = va_arg ( args, char * );
+			if ( ! ptr )
+				ptr = "<NULL>";
+		} else if ( *fmt == 'p' ) {
+			intptr_t ptrval;
+
+			ptrval = ( intptr_t ) va_arg ( args, void * );
+			ptr = format_hex ( ptr, ptrval, width, 
+					   ( ALT_FORM | LCASE ) );
+		} else if ( ( *fmt & ~0x20 ) == 'X' ) {
+			unsigned long long hex;
+
+			flags |= ( *fmt & 0x20 ); /* LCASE */
+			if ( *length >= sizeof ( unsigned long long ) ) {
+				hex = va_arg ( args, unsigned long long );
+			} else if ( *length >= sizeof ( unsigned long ) ) {
+				hex = va_arg ( args, unsigned long );
+			} else {
+				hex = va_arg ( args, unsigned int );
+			}
+			ptr = format_hex ( ptr, hex, width, flags );
+		} else if ( ( *fmt == 'd' ) || ( *fmt == 'i' ) ){
+			signed long decimal;
+
+			if ( *length >= sizeof ( signed long ) ) {
+				decimal = va_arg ( args, signed long );
+			} else {
+				decimal = va_arg ( args, signed int );
+			}
+			ptr = format_decimal ( ptr, decimal, width );
+		} else {
+			*(--ptr) = *fmt;
+		}
+		/* Write out conversion result */
+		for ( ; *ptr ; ptr++ ) {
+			cputchar ( ctx, *ptr );
+		}
+	}
+
+	return ctx->len;
+}
+
+/** Context used by vsnprintf() and friends */
+struct sputc_context {
+	struct printf_context ctx;
+	/** Buffer for formatted string (used by printf_sputc()) */
+	char *buf;
+	/** Buffer length (used by printf_sputc()) */
+	size_t max_len;	
+};
+
+/**
+ * Write character to buffer
+ *
+ * @v ctx		Context
+ * @v c			Character
+ */
+static void printf_sputc ( struct printf_context *ctx, unsigned int c ) {
+	struct sputc_context * sctx =
+		container_of ( ctx, struct sputc_context, ctx );
+
+	if ( ctx->len < sctx->max_len )
+		sctx->buf[ctx->len] = c;
+}
+
+/**
+ * Write a formatted string to a buffer
+ *
+ * @v buf		Buffer into which to write the string
+ * @v size		Size of buffer
+ * @v fmt		Format string
+ * @v args		Arguments corresponding to the format string
+ * @ret len		Length of formatted string
+ *
+ * If the buffer is too small to contain the string, the returned
+ * length is the length that would have been written had enough space
+ * been available.
+ */
+int vsnprintf ( char *buf, size_t size, const char *fmt, va_list args ) {
+	struct sputc_context sctx;
+	size_t len;
+	size_t end;
+
+	/* Hand off to vcprintf */
+	sctx.ctx.handler = printf_sputc;
+	sctx.buf = buf;
+	sctx.max_len = size;
+	len = vcprintf ( &sctx.ctx, fmt, args );
+
+	/* Add trailing NUL */
+	if ( size ) {
+		end = size - 1;
+		if ( len < end )
+			end = len;
+		buf[end] = '\0';
+	}
+
+	return len;
+}
+
+/**
+ * Write a formatted string to a buffer
+ *
+ * @v buf		Buffer into which to write the string
+ * @v size		Size of buffer
+ * @v fmt		Format string
+ * @v ...		Arguments corresponding to the format string
+ * @ret len		Length of formatted string
+ */
+int snprintf ( char *buf, size_t size, const char *fmt, ... ) {
+	va_list args;
+	int i;
+
+	va_start ( args, fmt );
+	i = vsnprintf ( buf, size, fmt, args );
+	va_end ( args );
+	return i;
+}
+
+/**
+ * Version of vsnprintf() that accepts a signed buffer size
+ *
+ * @v buf		Buffer into which to write the string
+ * @v size		Size of buffer
+ * @v fmt		Format string
+ * @v args		Arguments corresponding to the format string
+ * @ret len		Length of formatted string
+ */
+int vssnprintf ( char *buf, ssize_t ssize, const char *fmt, va_list args ) {
+
+	/* Treat negative buffer size as zero buffer size */
+	if ( ssize < 0 )
+		ssize = 0;
+
+	/* Hand off to vsnprintf */
+	return vsnprintf ( buf, ssize, fmt, args );
+}
+
+/**
+ * Version of vsnprintf() that accepts a signed buffer size
+ *
+ * @v buf		Buffer into which to write the string
+ * @v size		Size of buffer
+ * @v fmt		Format string
+ * @v ...		Arguments corresponding to the format string
+ * @ret len		Length of formatted string
+ */
+int ssnprintf ( char *buf, ssize_t ssize, const char *fmt, ... ) {
+	va_list args;
+	int len;
+
+	/* Hand off to vssnprintf */
+	va_start ( args, fmt );
+	len = vssnprintf ( buf, ssize, fmt, args );
+	va_end ( args );
+	return len;
+}
+
+/**
+ * Write character to console
+ *
+ * @v ctx		Context
+ * @v c			Character
+ */
+static void printf_putchar ( struct printf_context *ctx __unused,
+			     unsigned int c ) {
+	putchar ( c );
+}
+
+/**
+ * Write a formatted string to the console
+ *
+ * @v fmt		Format string
+ * @v args		Arguments corresponding to the format string
+ * @ret len		Length of formatted string
+ */
+int vprintf ( const char *fmt, va_list args ) {
+	struct printf_context ctx;
+
+	/* Hand off to vcprintf */
+	ctx.handler = printf_putchar;	
+	return vcprintf ( &ctx, fmt, args );	
+}
+
+/**
+ * Write a formatted string to the console.
+ *
+ * @v fmt		Format string
+ * @v ...		Arguments corresponding to the format string
+ * @ret	len		Length of formatted string
+ */
+int printf ( const char *fmt, ... ) {
+	va_list args;
+	int i;
+
+	va_start ( args, fmt );
+	i = vprintf ( fmt, args );
+	va_end ( args );
+	return i;
+}