diff options
Diffstat (limited to 'nuttx/lib/stdio/lib_sscanf.c')
-rw-r--r-- | nuttx/lib/stdio/lib_sscanf.c | 390 |
1 files changed, 390 insertions, 0 deletions
diff --git a/nuttx/lib/stdio/lib_sscanf.c b/nuttx/lib/stdio/lib_sscanf.c new file mode 100644 index 000000000..3430aa0a0 --- /dev/null +++ b/nuttx/lib/stdio/lib_sscanf.c @@ -0,0 +1,390 @@ +/**************************************************************************** + * lib/stdio/lib_sscanf.c + * + * Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/compiler.h> +#include <sys/types.h> +#include <stdarg.h> +#include <stdlib.h> +#include <string.h> +#include <ctype.h> +#include <debug.h> + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +#define MAXLN 128 + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Global Function Prototypes + ****************************************************************************/ + +int vsscanf(char *buf, const char *s, va_list ap); + +/************************************************************************** + * Global Constant Data + **************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/************************************************************************** + * Private Constant Data + **************************************************************************/ + +static const char spaces[] = " \t\n\r\f\v"; + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Function: sscanf + * + * Description: + * ANSI standard sscanf implementation. + * + ****************************************************************************/ + +int sscanf(const char *buf, const char *fmt, ...) +{ + va_list ap; + int count; + + va_start(ap, fmt); + count = vsscanf((char*)buf, fmt, ap); + va_end(ap); + return count; +} + +/**************************************************************************** + * Function: vsscanf + * + * Description: + * ANSI standard vsscanf implementation. + * + ****************************************************************************/ +int vsscanf(char *buf, const char *s, va_list ap) +{ + int count; + int noassign; + int width; + int base = 10; + int lflag; + char *tv; + const char *tc; + char tmp[MAXLN]; + + lvdbg("vsscanf: buf=\"%s\" fmt=\"%s\"\n", buf, s); + + count = noassign = width = lflag = 0; + while (*s && *buf) + { + /* Skip over white space */ + + while (isspace(*s)) + { + s++; + } + + /* Check for a conversion specifier */ + + if (*s == '%') + { + lvdbg("vsscanf: Specifier found\n"); + + /* Check for qualifiers on the conversion specifier */ + s++; + for (; *s; s++) + { + lvdbg("vsscanf: Processing %c\n", *s); + + if (strchr("dibouxcsefg%", *s)) + { + break; + } + + if (*s == '*') + { + noassign = 1; + } + else if (*s == 'l' || *s == 'L') + { + lflag = 1; + } + else if (*s >= '1' && *s <= '9') + { + for (tc = s; isdigit(*s); s++); + strncpy(tmp, tc, s - tc); + tmp[s - tc] = '\0'; + width = atoi(tmp); + s--; + } + } + + /* Process %s: String conversion */ + + if (*s == 's') + { + lvdbg("vsscanf: Performing string conversion\n"); + + while (isspace(*buf)) + { + buf++; + } + + if (!width) + { + width = strcspn(buf, spaces); + } + + if (!noassign) + { + tv = va_arg(ap, char*); + strncpy(tv, buf, width); + tv[width] = '\0'; + } + buf += width; + } + + /* Process %c: Character conversion */ + + else if (*s == 'c') + { + lvdbg("vsscanf: Performing character conversion\n"); + + if (!width) + { + width = 1; + } + + if (!noassign) + { + tv = va_arg(ap, char*); + strncpy(tv, buf, width); + tv[width] = '\0'; + } + buf += width; + } + + /* Process %d, %o, %b, %x, %u: Various integer conversions */ + + else if (strchr("dobxu", *s)) + { + lvdbg("vsscanf: Performing integer conversion\n"); + + /* Skip over any white space before the integer string */ + + while (isspace(*buf)) + { + buf++; + } + + /* The base of the integer conversion depends on the specific + * conversion specification. + */ + + if (*s == 'd' || *s == 'u') + { + base = 10; + } + else if (*s == 'x') + { + base = 16; + } + else if (*s == 'o') + { + base = 8; + } + else if (*s == 'b') + { + base = 2; + } + + /* Copy the integer string into a temporary working buffer. */ + + if (!width) + { + if (isspace(*(s + 1)) || *(s + 1) == 0) + { + width = strcspn(buf, spaces); + } + else + { + width = strchr(buf, *(s + 1)) - buf; + } + } + + strncpy(tmp, buf, width); + tmp[width] = '\0'; + + lvdbg("vsscanf: tmp[]=\"%s\"\n", tmp); + + /* Perform the integer conversion */ + + buf += width; + if (!noassign) + { + int *pint = va_arg(ap, int*); +#ifdef SDCC + char *endptr; + int tmpint = strtol(tmp, &endptr, base); +#else + int tmpint = strtol(tmp, NULL, base); +#endif + lvdbg("vsscanf: Return %d to 0x%p\n", tmpint, pint); + *pint = tmpint; + } + } + + /* Process %f: Floating point conversion */ + + else if (*s == 'f') + { +#ifndef CONFIG_LIBC_FLOATINGPOINT + /* No floating point conversions */ + + void *pv = va_arg(ap, void*); + + lvdbg("vsscanf: Return 0.0 to %p\n", pv); + *((double_t*)pv) = 0.0; +#else + lvdbg("vsscanf: Performing floating point conversion\n"); + + /* Skip over any white space before the real string */ + + while (isspace(*buf)) + { + buf++; + } + + /* Copy the real string into a temporary working buffer. */ + + if (!width) + { + if (isspace(*(s + 1)) || *(s + 1) == 0) + { + width = strcspn(buf, spaces); + } + else + { + width = strchr(buf, *(s + 1)) - buf; + } + } + + strncpy(tmp, buf, width); + tmp[width] = '\0'; + buf += width; + + lvdbg("vsscanf: tmp[]=\"%s\"\n", tmp); + + /* Perform the floating point conversion */ + + if (!noassign) + { + /* strtod always returns a double */ +#ifdef SDCC + char *endptr; + double_t dvalue = strtod(tmp,&endptr); +#else + double_t dvalue = strtod(tmp, NULL); +#endif + void *pv = va_arg(ap, void*); + + lvdbg("vsscanf: Return %f to %p\n", dvalue, pv); + + /* But we have to check whether we need to return a + * float or a double. + */ + +#ifdef CONFIG_HAVE_DOUBLE + if (lflag) + { + *((double_t*)pv) = dvalue; + } + else +#endif + { + *((float*)pv) = (float)dvalue; + } + } +#endif + } + + if (!noassign) + { + count++; + } + + width = noassign = lflag = 0; + s++; + } + + /* Its is not a conversion specifier */ + + else + { + while (isspace(*buf)) + { + buf++; + } + + if (*s != *buf) + { + break; + } + else + { + s++; + buf++; + } + } + } + + return count; +} |