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390 lines
11 KiB
390 lines
11 KiB
/**************************************************************************** |
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* lib/stdio/lib_sscanf.c |
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* |
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* Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/compiler.h> |
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#include <sys/types.h> |
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#include <stdarg.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <ctype.h> |
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#include <debug.h> |
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/**************************************************************************** |
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* Definitions |
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****************************************************************************/ |
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#define MAXLN 128 |
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/**************************************************************************** |
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* Private Type Declarations |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Function Prototypes |
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****************************************************************************/ |
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/**************************************************************************** |
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* Global Function Prototypes |
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****************************************************************************/ |
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int vsscanf(char *buf, const char *s, va_list ap); |
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/************************************************************************** |
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* Global Constant Data |
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**************************************************************************/ |
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/**************************************************************************** |
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* Global Variables |
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****************************************************************************/ |
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/************************************************************************** |
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* Private Constant Data |
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**************************************************************************/ |
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static const char spaces[] = " \t\n\r\f\v"; |
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/**************************************************************************** |
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* Private Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Function: sscanf |
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* |
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* Description: |
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* ANSI standard sscanf implementation. |
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* |
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****************************************************************************/ |
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int sscanf(const char *buf, const char *fmt, ...) |
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{ |
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va_list ap; |
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int count; |
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va_start(ap, fmt); |
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count = vsscanf((char*)buf, fmt, ap); |
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va_end(ap); |
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return count; |
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} |
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/**************************************************************************** |
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* Function: vsscanf |
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* |
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* Description: |
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* ANSI standard vsscanf implementation. |
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* |
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****************************************************************************/ |
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int vsscanf(char *buf, const char *s, va_list ap) |
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{ |
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int count; |
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int noassign; |
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int width; |
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int base = 10; |
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int lflag; |
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char *tv; |
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const char *tc; |
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char tmp[MAXLN]; |
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lvdbg("vsscanf: buf=\"%s\" fmt=\"%s\"\n", buf, s); |
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count = noassign = width = lflag = 0; |
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while (*s && *buf) |
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{ |
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/* Skip over white space */ |
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while (isspace(*s)) |
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{ |
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s++; |
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} |
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/* Check for a conversion specifier */ |
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if (*s == '%') |
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{ |
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lvdbg("vsscanf: Specifier found\n"); |
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/* Check for qualifiers on the conversion specifier */ |
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s++; |
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for (; *s; s++) |
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{ |
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lvdbg("vsscanf: Processing %c\n", *s); |
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if (strchr("dibouxcsefg%", *s)) |
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{ |
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break; |
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} |
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if (*s == '*') |
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{ |
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noassign = 1; |
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} |
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else if (*s == 'l' || *s == 'L') |
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{ |
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lflag = 1; |
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} |
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else if (*s >= '1' && *s <= '9') |
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{ |
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for (tc = s; isdigit(*s); s++); |
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strncpy(tmp, tc, s - tc); |
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tmp[s - tc] = '\0'; |
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width = atoi(tmp); |
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s--; |
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} |
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} |
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/* Process %s: String conversion */ |
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if (*s == 's') |
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{ |
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lvdbg("vsscanf: Performing string conversion\n"); |
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while (isspace(*buf)) |
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{ |
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buf++; |
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} |
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if (!width) |
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{ |
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width = strcspn(buf, spaces); |
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} |
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if (!noassign) |
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{ |
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tv = va_arg(ap, char*); |
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strncpy(tv, buf, width); |
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tv[width] = '\0'; |
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} |
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buf += width; |
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} |
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/* Process %c: Character conversion */ |
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else if (*s == 'c') |
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{ |
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lvdbg("vsscanf: Performing character conversion\n"); |
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if (!width) |
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{ |
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width = 1; |
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} |
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if (!noassign) |
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{ |
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tv = va_arg(ap, char*); |
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strncpy(tv, buf, width); |
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tv[width] = '\0'; |
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} |
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buf += width; |
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} |
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/* Process %d, %o, %b, %x, %u: Various integer conversions */ |
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else if (strchr("dobxu", *s)) |
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{ |
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lvdbg("vsscanf: Performing integer conversion\n"); |
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/* Skip over any white space before the integer string */ |
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while (isspace(*buf)) |
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{ |
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buf++; |
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} |
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/* The base of the integer conversion depends on the specific |
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* conversion specification. |
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*/ |
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if (*s == 'd' || *s == 'u') |
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{ |
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base = 10; |
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} |
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else if (*s == 'x') |
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{ |
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base = 16; |
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} |
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else if (*s == 'o') |
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{ |
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base = 8; |
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} |
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else if (*s == 'b') |
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{ |
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base = 2; |
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} |
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/* Copy the integer string into a temporary working buffer. */ |
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if (!width) |
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{ |
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if (isspace(*(s + 1)) || *(s + 1) == 0) |
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{ |
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width = strcspn(buf, spaces); |
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} |
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else |
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{ |
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width = strchr(buf, *(s + 1)) - buf; |
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} |
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} |
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strncpy(tmp, buf, width); |
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tmp[width] = '\0'; |
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lvdbg("vsscanf: tmp[]=\"%s\"\n", tmp); |
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/* Perform the integer conversion */ |
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buf += width; |
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if (!noassign) |
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{ |
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int *pint = va_arg(ap, int*); |
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#ifdef SDCC |
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char *endptr; |
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int tmpint = strtol(tmp, &endptr, base); |
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#else |
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int tmpint = strtol(tmp, NULL, base); |
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#endif |
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lvdbg("vsscanf: Return %d to 0x%p\n", tmpint, pint); |
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*pint = tmpint; |
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} |
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} |
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/* Process %f: Floating point conversion */ |
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else if (*s == 'f') |
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{ |
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#ifndef CONFIG_LIBC_FLOATINGPOINT |
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/* No floating point conversions */ |
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void *pv = va_arg(ap, void*); |
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lvdbg("vsscanf: Return 0.0 to %p\n", pv); |
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*((double_t*)pv) = 0.0; |
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#else |
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lvdbg("vsscanf: Performing floating point conversion\n"); |
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/* Skip over any white space before the real string */ |
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while (isspace(*buf)) |
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{ |
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buf++; |
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} |
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/* Copy the real string into a temporary working buffer. */ |
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if (!width) |
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{ |
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if (isspace(*(s + 1)) || *(s + 1) == 0) |
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{ |
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width = strcspn(buf, spaces); |
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} |
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else |
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{ |
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width = strchr(buf, *(s + 1)) - buf; |
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} |
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} |
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strncpy(tmp, buf, width); |
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tmp[width] = '\0'; |
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buf += width; |
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lvdbg("vsscanf: tmp[]=\"%s\"\n", tmp); |
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/* Perform the floating point conversion */ |
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if (!noassign) |
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{ |
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/* strtod always returns a double */ |
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#ifdef SDCC |
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char *endptr; |
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double_t dvalue = strtod(tmp,&endptr); |
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#else |
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double_t dvalue = strtod(tmp, NULL); |
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#endif |
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void *pv = va_arg(ap, void*); |
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lvdbg("vsscanf: Return %f to %p\n", dvalue, pv); |
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/* But we have to check whether we need to return a |
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* float or a double. |
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*/ |
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#ifdef CONFIG_HAVE_DOUBLE |
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if (lflag) |
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{ |
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*((double_t*)pv) = dvalue; |
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} |
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else |
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#endif |
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{ |
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*((float*)pv) = (float)dvalue; |
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} |
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} |
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#endif |
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} |
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if (!noassign) |
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{ |
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count++; |
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} |
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width = noassign = lflag = 0; |
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s++; |
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} |
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/* Its is not a conversion specifier */ |
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else |
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{ |
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while (isspace(*buf)) |
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{ |
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buf++; |
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} |
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if (*s != *buf) |
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{ |
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break; |
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} |
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else |
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{ |
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s++; |
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buf++; |
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} |
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} |
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} |
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return count; |
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}
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