/**************************************************************************** * lib/stdio/lib_sscanf.c * * Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include /**************************************************************************** * 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; } /* end sscanf */ /**************************************************************************** * 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); /* atob(&width, tmp, 10); */ 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; }