--- parser3/src/main/pa_common.C 2001/10/31 16:19:58 1.83 +++ parser3/src/main/pa_common.C 2002/02/08 08:32:34 1.102 @@ -1,10 +1,10 @@ /** @file Parser: commonly functions. - Copyright(c) 2001 ArtLebedev Group(http://www.artlebedev.com) - Author: Alexander Petrosyan (http://design.ru/paf) + Copyright(c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com) + Author: Alexandr Petrosian (http://paf.design.ru) - $Id: pa_common.C,v 1.83 2001/10/31 16:19:58 paf Exp $ + $Id: pa_common.C,v 1.102 2002/02/08 08:32:34 paf Exp $ */ #include "pa_common.h" @@ -16,6 +16,12 @@ #include "pa_hash.h" #include "pa_string.h" +#ifdef WIN32 +# include +#endif + +// some maybe-undefined constants + #ifndef _O_TEXT # define _O_TEXT 0 #endif @@ -26,36 +32,75 @@ # define O_TRUNC 0 #endif -#if _MSC_VER +// locking constants -int __vsnprintf(char *b, size_t s, const char *f, va_list l) { - int r=_vsnprintf(b, --s, f, l); - b[s]=0; - return r; -} -int __snprintf(char *b, size_t s, const char *f, ...) { - va_list l; - va_start(l, f); - int r=__vsnprintf(b, s, f, l); - va_end(l); - return r; -} +#ifdef HAVE_FLOCK + +static int lock_shared_blocking(int fd) { return flock(fd, LOCK_SH); } +static int lock_exclusive_blocking(int fd) { return flock(fd, LOCK_EX); } +static int lock_exclusive_nonblocking(int fd) { return flock(fd, LOCK_EX || LOCK_NB); } +static int unlock(int fd) { return flock(fd, LOCK_UN); } + +#else +#ifdef HAVE__LOCKING +#define FLOCK(operation) lseek(fd, 0, SEEK_SET); return _locking(fd, operation, 1) +static int lock_shared_blocking(int fd) { FLOCK(_LK_LOCK); } +static int lock_exclusive_blocking(int fd) { FLOCK(_LK_LOCK); } +static int lock_exclusive_nonblocking(int fd) { FLOCK(_LK_NBLCK); } +static int unlock(int fd) { FLOCK(_LK_UNLCK); } + +#else +#ifdef HAVE_FCNTL + +#define FLOCK(cmd, arg) struct flock ls={arg, SEEK_SET}; return fcntl(fd, cmd, &ls) +static int lock_shared_blocking(int fd) { FLOCK(F_SETLKW, F_RDLCK); } +static int lock_exclusive_blocking(int fd) { FLOCK(F_SETLKW, F_WRLCK); } +static int lock_exclusive_nonblocking(int fd) { FLOCK(F_SETLK, F_RDLCK); } +static int unlock(int fd) { FLOCK(F_SETLK, F_UNLCK); } + +#else +#ifdef HAVE_LOCKF + +#define FLOCK(fd, operation) lseek(fd, 0, SEEK_SET); return lockf(fd, operation, 1) +static int lock_shared_blocking(int fd) { FLOCK(F_LOCK); } // on intel solaris man doesn't have doc on shared blocking +static int lock_exclusive_blocking(int fd) { FLOCK(F_LOCK); } +static int lock_exclusive_nonblocking(int fd) { FLOCK(F_TLOCK); } +static int unlock(int fd) { FLOCK(F_TLOCK); } + +#else + +#error unable to find file locking func + +#endif #endif +#endif +#endif + +static char *strnchr(char *buf, size_t size, char c) { + for(; size-->0; buf++) { + if(*buf==c) + return buf; + } + + return 0; +} -void fix_line_breaks(char *cstr, size_t& size) { - char *dest=cstr; +void fix_line_breaks(char *buf, size_t& size) { + //_asm int 3; + const char * const eob=buf+size; + char *dest=buf; // fix DOS: \r\n -> \n // fix Macintosh: \r -> \n - char *bol=cstr; - while(char *eol=strchr(bol, '\r')) { + char *bol=buf; + while(char *eol=strnchr(bol, eob -bol, '\r')) { size_t len=eol-bol; if(dest!=bol) memcpy(dest, bol, len); dest+=len; *dest++='\n'; - if(eol[1]=='\n') { // \r,\n = DOS + if(&eol[1]=0 && - stat(fname, &finfo)==0) { - /*if(exclusive) - flock(f, LOCK_EX);*/ - size_t max_size=limit?min(offset+limit, finfo.st_size)-offset:finfo.st_size; + if((f=open(fname, O_RDONLY|(as_text?_O_TEXT:_O_BINARY)))>=0) { + lock_shared_blocking(f); + if(stat(fname, &finfo)!=0) { + Exception e(0, 0, + &file_spec, + "stat failed: %s (%d), actual filename '%s'", + strerror(errno), errno, fname); + unlock(f); + close(f); + if(fail_on_read_problem) + throw e; + return false; + } + size_t max_size=limit?min(offset+limit, (size_t)finfo.st_size)-offset:finfo.st_size; if(!max_size) { // eof if(as_text) { data=pool.malloc(1); *(char*)data=0; } else data=0; - read_size=0; + data_size=0; } else { data=pool.malloc(max_size+(as_text?1:0), 3); if(offset) lseek(f, offset, SEEK_SET); - read_size=read(f, data, max_size); + data_size=read(f, data, max_size); } - /*if(exclusive) - flock(f, LOCK_UN);*/ + unlock(f); close(f); if(!max_size) // eof return true; - if(read_size>=0 && read_size<=max_size) { - if(as_text) - ((char*&)data)[read_size]=0; - } else + if(int(data_size)<0 || data_size>max_size) throw Exception(0, 0, &file_spec, "read failed: actually read %d bytes count not in [0..%lu] valid range", - read_size, (unsigned long)max_size); //never - - if(as_text) - fix_line_breaks((char *)data, read_size); + data_size, (unsigned long)max_size); //never + + if(as_text) { + fix_line_breaks((char *)data, data_size); + // note: after fixing + ((char*&)data)[data_size]=0; + } return true; } if(fail_on_read_problem) @@ -142,12 +194,12 @@ static void create_dir_for_file(const St } } -void file_write(Pool& pool, +bool file_write_action_under_lock( const String& file_spec, - const void *data, size_t size, + const char *action_name, void (*action)(int, void *), void *context, bool as_text, - bool do_append/*, - bool exclusive*/) { + bool do_append, + bool do_block) { const char *fname=file_spec.cstr(String::UL_FILE_SPEC); int f; if(access(fname, W_OK)!=0) // no @@ -156,22 +208,58 @@ void file_write(Pool& pool, if((f=open(fname, O_CREAT|O_RDWR |(as_text?_O_TEXT:_O_BINARY) - |(do_append?O_APPEND:O_TRUNC), 0666))>=0) { - /*if(exclusive) - flock(f, LOCK_EX);*/ + |(do_append?O_APPEND:0), 0664))>=0) { + if((do_block?lock_exclusive_blocking(f):lock_exclusive_nonblocking(f))!=0) { + close(f); + return false; + } + + try { + action(f, context); + } catch(...) { +#if O_TRUNC==0 + ftruncate(f, tell(f)); +#endif + unlock(f); + close(f); + /*re*/throw; + } - if(size) write(f, data, size); #if O_TRUNC==0 - ftruncate(f, size); + ftruncate(f, tell(f)); #endif - /*if(exclusive) - flock(f, LOCK_UN);*/ + unlock(f); close(f); + return true; } else throw Exception(0, 0, &file_spec, - "write failed: %s (%d), actual filename '%s'", - strerror(errno), errno, fname); + "%s failed: %s (%d), actual filename '%s'", + action_name, strerror(errno), errno, fname); + // here should be nothing, see rethrow above +} + +#ifndef DOXYGEN +struct File_write_action_info { + const void *data; size_t size; +}; +#endif +static void file_write_action(int f, void *context) { + File_write_action_info& info=*static_cast(context); + if(info.size) + write(f, info.data, info.size); +} +void file_write( + const String& file_spec, + const void *data, size_t size, + bool as_text, + bool do_append) { + File_write_action_info info={data, size}; + file_write_action_under_lock( + file_spec, + "write", file_write_action, &info, + as_text, + do_append); } // throws nothing! [this is required in file_move & file_delete] @@ -182,17 +270,21 @@ static void rmdir(const String& file_spe rmdir(file_spec.mid(0, pos_after-1/* / */).cstr(String::UL_FILE_SPEC)); } -void file_delete(Pool& pool, const String& file_spec) { +bool file_delete(const String& file_spec, bool fail_on_read_problem) { const char *fname=file_spec.cstr(String::UL_FILE_SPEC); if(unlink(fname)!=0) - throw Exception(0, 0, - &file_spec, - "unlink failed: %s (%d), actual filename '%s'", - strerror(errno), errno, fname); + if(fail_on_read_problem) + throw Exception(0, 0, + &file_spec, + "unlink failed: %s (%d), actual filename '%s'", + strerror(errno), errno, fname); + else + return false; rmdir(file_spec, 1); + return true; } -void file_move(Pool& pool, const String& old_spec, const String& new_spec) { +void file_move(const String& old_spec, const String& new_spec) { const char *old_spec_cstr=old_spec.cstr(String::UL_FILE_SPEC); const char *new_spec_cstr=new_spec.cstr(String::UL_FILE_SPEC); @@ -442,7 +534,7 @@ bool StrEqNc(const char *s1, const char } } -static int isLeap(int year) { +static bool isLeap(int year) { return !( (year % 4) || ((year % 400) && !(year % 100)) ); @@ -473,3 +565,68 @@ void remove_crlf(char *start, char *end) case '\r': *p=' '; break; } } + + +/// must be last in this file +#undef vsnprintf +int __vsnprintf(char *b, size_t s, const char *f, va_list l) { + if(!s) + return 0; + + int r; + // note: on win32& maybe somewhere else + // vsnprintf do not writes terminating 0 in 'buffer full' case, reducing + --s; +#if _MSC_VER + /* + win32: + mk:@MSITStore:C:\Program%20Files\Microsoft%20Visual%20Studio\MSDN\2001APR\1033\vccore.chm::/html/_crt__vsnprintf.2c_._vsnwprintf.htm + + if the number of bytes to write exceeds buffer, then count bytes are written and –1 is returned + */ + r=_vsnprintf(b, s, f, l); + if(r<0) + r=s; +#else + r=vsnprintf(b, s, f, l); + /* + solaris: + man vsnprintf + + The snprintf() function returns the number of characters + formatted, that is, the number of characters that would have + been written to the buffer if it were large enough. If the + value of n is 0 on a call to snprintf(), an unspecified + value less than 1 is returned. + */ + + if(r<0) + r=0; + else if(r>s) + r=s; +#endif + b[r]=0; + return r; +} + +int __snprintf(char *b, size_t s, const char *f, ...) { + va_list l; + va_start(l, f); + int r=__vsnprintf(b, s, f, l); + va_end(l); + return r; +} + +int pa_sleep(unsigned long secs, unsigned long usecs) { + for (; usecs >= 1000000; ++secs, usecs -= 1000000); + +#ifdef WIN32 + Sleep(secs * 1000 + usecs / 1000); + return 0; +#else + struct timeval t; + t.tv_sec = secs; + t.tv_usec = usecs; + return (select(0, NULL, NULL, NULL, &t) == -1 ? errno : 0); +#endif +}