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7d06db201f
1. Add precision to limit string length.
ccprintf("%.4s", "foobar") prints "foob"
2. Handle '*' for length, precision fields.
ccprintf("%.*s", 3, "foobar") prints "foo"
3. Add hex-dump code "%h"
ccprintf("%.*s", 4, "foobar") prints 666f6f62
BUG=none
TEST=at ec console, 'hash' prints the current hash
Change-Id: I568310f2727495b021081bf58df2a0bbb3c74e73
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/28704
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Printf-like functionality for Chrome EC */
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#ifndef __CROS_EC_PRINTF_H
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#define __CROS_EC_PRINTF_H
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#include <stdarg.h> /* For va_list */
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#include "common.h"
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/*
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* Printf formatting: % [flags] [width] [.precision] [length] [type]
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*
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* Flags may be any/all of the following, and must occur in the following
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* order if present:
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* - '0' = prefixed with 0's instead of spaces (%08x)
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* - '-' = left-justify instead of right-justify (%-5s)
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*
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* Width is the minimum output width, and may be:
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* - A number ("0" - "255")
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* - '*' = use next integer argument as width
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*
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* Precision must be preceded by a decimal point, and may be:
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* - A number ("0" - "255")
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* - '*' = use next integer argument as precision
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*
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* For integers, precision will put a decimal point before that many digits.
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* So snprintf(buf, size, "%.6d", 123) sets buf="0.000123". This is most
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* useful for printing times, voltages, and currents.
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*
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* Length may be:
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* - 'l' = integer is 64-bit instead of native 32-bit
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*
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* Type may be:
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* - 'c' - character
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* - 's' - null-terminated ASCII string
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* - 'h' - binary data, print as hex; precision is length of data in bytes.
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* So "%.8h" prints 8 bytes of binary data
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* - 'p' - pointer
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* - 'd' - signed integer
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* - 'u' - unsigned integer
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* - 'x' - unsigned integer, print as lower-case hexadecimal
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* - 'X' - unsigned integer, print as upper-case hexadecimal
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* - 'b' - unsigned integer, print as binary
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*
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* Special format codes:
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* - "%T" - current time in seconds - interpreted as "%.6T" for precision.
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* This does NOT use up any arguments.
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*/
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/**
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* Print formatted output to a function, like vfprintf()
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*
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* addchar() will be called for every character to be printed, with the context
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* pointer passed to vfnprintf(). addchar() should return 0 if the character
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* was accepted or non-zero if the character was dropped due to overflow.
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*
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* Returns error if output was truncated.
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*/
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int vfnprintf(int (*addchar)(void *context, int c), void *context,
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const char *format, va_list args);
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/* Print formatted outut to a string */
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int snprintf(char *str, int size, const char *format, ...);
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#endif /* __CROS_EC_PRINTF_H */
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