/************************************************************************** libpm.c *************************************************************************** This file contains fundamental libnetpbm services. Some of the subroutines in this library are intended and documented for use by Netpbm users, but most of them are just used by other Netpbm library subroutines. **************************************************************************/ #define _DEFAULT_SOURCE /* New name for SVID & BSD source defines */ #define _XOPEN_SOURCE 500 /* Make sure ftello, fseeko are defined */ #include "netpbm/pm_config.h" #include #include #include #include #include #include #include #include #include #if HAVE_FORK #include #endif #include #include "netpbm/pm_c_util.h" #include "netpbm/mallocvar.h" #include "netpbm/version.h" #include "netpbm/nstring.h" #include "netpbm/shhopt.h" #include "compile.h" #include "pm.h" /* The following are set by pm_init(), then used by subsequent calls to other pm_xxx() functions. */ const char * pm_progname; int pm_plain_output; /* Boolean: programs should produce output in plain format */ static bool pm_showmessages; /* Programs should display informational messages (because the user didn't specify the --quiet option). */ static jmp_buf * pm_jmpbufP = NULL; /* A description of the point to which the program should hyperjump if a libnetpbm function encounters an error (libnetpbm functions don't normally return in that case). User sets this to something in his own extra-library context. Libnetpbm routines that have something that needs to be cleaned up preempt it. NULL, which is the default value, means when a libnetpbm function encounters an error, it causes the process to exit. */ static pm_usererrormsgfn * userErrorMsgFn = NULL; /* A function to call to issue an error message. NULL means use the library default: print to Standard Error */ static pm_usermessagefn * userMessageFn = NULL; /* A function to call to issue a non-error message. NULL means use the library default: print to Standard Error */ void pm_setjmpbuf(jmp_buf * const jmpbufP) { pm_jmpbufP = jmpbufP; } void pm_setjmpbufsave(jmp_buf * const jmpbufP, jmp_buf ** const oldJmpbufPP) { *oldJmpbufPP = pm_jmpbufP; pm_jmpbufP = jmpbufP; } void pm_longjmp(void) { if (pm_jmpbufP) longjmp(*pm_jmpbufP, 1); else exit(1); } void pm_fork(int * const iAmParentP, pid_t * const childPidP, const char ** const errorP) { /*---------------------------------------------------------------------------- Same as POSIX fork, except with a nicer interface and works (fails cleanly) on systems that don't have POSIX fork(). -----------------------------------------------------------------------------*/ #if HAVE_FORK int rc; rc = fork(); if (rc < 0) { pm_asprintf(errorP, "Failed to fork a process. errno=%d (%s)", errno, strerror(errno)); } else { *errorP = NULL; if (rc == 0) { *iAmParentP = FALSE; } else { *iAmParentP = TRUE; *childPidP = rc; } } #else pm_asprintf(errorP, "Cannot fork a process, because this system does " "not have POSIX fork()"); #endif } void pm_waitpid(pid_t const pid, int * const statusP, int const options, pid_t * const exitedPidP, const char ** const errorP) { #if HAVE_FORK pid_t rc; rc = waitpid(pid, statusP, options); if (rc == (pid_t)-1) { pm_asprintf(errorP, "Failed to wait for process exit. " "waitpid() errno = %d (%s)", errno, strerror(errno)); } else { *exitedPidP = rc; *errorP = NULL; } #else pm_error("INTERNAL ERROR: Attempt to wait for a process we created on " "a system on which we can't create processes"); #endif } void pm_waitpidSimple(pid_t const pid) { int status; pid_t exitedPid; const char * error; pm_waitpid(pid, &status, 0, &exitedPid, &error); if (error) { pm_errormsg("%s", error); pm_strfree(error); pm_longjmp(); } else { assert(exitedPid != 0); } } void pm_setusererrormsgfn(pm_usererrormsgfn * fn) { userErrorMsgFn = fn; } void pm_setusermessagefn(pm_usermessagefn * fn) { userMessageFn = fn; } void pm_usage(const char usage[]) { pm_error("usage: %s %s", pm_progname, usage); } void PM_GNU_PRINTF_ATTR(1,2) pm_message(const char format[], ...) { va_list args; va_start(args, format); if (pm_showmessages) { const char * msg; pm_vasprintf(&msg, format, args); if (userMessageFn) userMessageFn(msg); else fprintf(stderr, "%s: %s\n", pm_progname, msg); pm_strfree(msg); } va_end(args); } static void errormsg(const char * const msg) { if (userErrorMsgFn) userErrorMsgFn(msg); else fprintf(stderr, "%s: %s\n", pm_progname, msg); } void PM_GNU_PRINTF_ATTR(1,2) pm_errormsg(const char format[], ...) { va_list args; const char * msg; va_start(args, format); pm_vasprintf(&msg, format, args); errormsg(msg); pm_strfree(msg); va_end(args); } void PM_GNU_PRINTF_ATTR(1,2) pm_error(const char format[], ...) { va_list args; const char * msg; va_start(args, format); pm_vasprintf(&msg, format, args); errormsg(msg); pm_strfree(msg); va_end(args); pm_longjmp(); } int pm_have_float_format(void) { /*---------------------------------------------------------------------------- Return 1 if %f, %e, and %g work in format strings for pm_message, etc.; 0 otherwise. Where they don't "work," that means the specifier just appears itself in the formatted strings, e.g. "the number is g". -----------------------------------------------------------------------------*/ return pm_vasprintf_knows_float(); } static void * mallocz(size_t const size) { return malloc(MAX(1, size)); } void * pm_allocrow(unsigned int const cols, unsigned int const size) { unsigned char * itrow; if (cols != 0 && UINT_MAX / cols < size) pm_error("Arithmetic overflow multiplying %u by %u to get the " "size of a row to allocate.", cols, size); itrow = mallocz(cols * size); if (itrow == NULL) pm_error("out of memory allocating a row"); return itrow; } void pm_freerow(void * const itrow) { free(itrow); } char ** pm_allocarray(int const cols, int const rows, int const elementSize ) { /*---------------------------------------------------------------------------- This is for backward compatibility. MALLOCARRAY2 is usually better. A problem with pm_allocarray() is that its return type is char ** even though 'elementSize' can be other than 1. So users have traditionally type cast the result. In the old days, that was just messy; modern compilers can produce the wrong code if you do that. -----------------------------------------------------------------------------*/ char ** retval; void * result; pm_mallocarray2(&result, rows, cols, elementSize); if (result == NULL) pm_error("Failed to allocate a raster array of %u columns x %u rows", cols, rows); retval = result; return retval; } void pm_freearray(char ** const rowIndex, int const rows) { void * const rowIndexVoid = rowIndex; pm_freearray2(rowIndexVoid); } /* Case-insensitive keyword matcher. */ int pm_keymatch(const char * const strarg, const char * const keywordarg, int const minchars) { int len; const char * keyword; const char * str; str = strarg; keyword = keywordarg; len = strlen( str ); if ( len < minchars ) return 0; while ( --len >= 0 ) { register char c1, c2; c1 = *str++; c2 = *keyword++; if ( c2 == '\0' ) return 0; if ( ISUPPER( c1 ) ) c1 = tolower( c1 ); if ( ISUPPER( c2 ) ) c2 = tolower( c2 ); if ( c1 != c2 ) return 0; } return 1; } /* Log base two hacks. */ int pm_maxvaltobits(int const maxval) { if ( maxval <= 1 ) return 1; else if ( maxval <= 3 ) return 2; else if ( maxval <= 7 ) return 3; else if ( maxval <= 15 ) return 4; else if ( maxval <= 31 ) return 5; else if ( maxval <= 63 ) return 6; else if ( maxval <= 127 ) return 7; else if ( maxval <= 255 ) return 8; else if ( maxval <= 511 ) return 9; else if ( maxval <= 1023 ) return 10; else if ( maxval <= 2047 ) return 11; else if ( maxval <= 4095 ) return 12; else if ( maxval <= 8191 ) return 13; else if ( maxval <= 16383 ) return 14; else if ( maxval <= 32767 ) return 15; else if ( (long) maxval <= 65535L ) return 16; else pm_error( "maxval of %d is too large!", maxval ); assert(false); } int pm_bitstomaxval(int const bitCt) { if (bitCt > 16) pm_error("Bits per sample %u too large. 16 is maximum acceptable", bitCt); return (1 << bitCt) - 1; } unsigned int PURE_FN_ATTR pm_lcm(unsigned int const x, unsigned int const y, unsigned int const z, unsigned int const limit) { /*---------------------------------------------------------------------------- Compute the least common multiple of 'x', 'y', and 'z'. If it's bigger than 'limit', though, just return 'limit'. -----------------------------------------------------------------------------*/ unsigned int biggest; unsigned int candidate; if (x == 0 || y == 0 || z == 0) pm_error("pm_lcm(): Least common multiple of zero taken."); biggest = MAX(x, MAX(y,z)); candidate = biggest; while (((candidate % x) != 0 || /* not a multiple of x */ (candidate % y) != 0 || /* not a multiple of y */ (candidate % z) != 0 ) && /* not a multiple of z */ candidate <= limit) candidate += biggest; if (candidate > limit) candidate = limit; return candidate; } void pm_init(const char * const progname, unsigned int const flags) { /*---------------------------------------------------------------------------- Initialize static variables that Netpbm library routines use. Any user of Netpbm library routines is expected to call this at the beginning of this program, before any other Netpbm library routines. A program may call this via pm_proginit() instead, though. -----------------------------------------------------------------------------*/ pm_setMessage(FALSE, NULL); pm_progname = progname; #ifdef O_BINARY #ifdef HAVE_SETMODE /* Set the stdin and stdout mode to binary. This means nothing on Unix, but matters on Windows. Note that stdin and stdout aren't necessarily image files. In particular, stdout is sometimes text for human consumption, typically printed on the terminal. Binary mode isn't really appropriate for that case. We do this setting here without any knowledge of how stdin and stdout are being used because it is easy. But we do make an exception for the case that we know the file is a terminal, to get a little closer to doing the right thing. */ if (!isatty(0)) setmode(0,O_BINARY); /* Standard Input */ if (!isatty(1)) setmode(1,O_BINARY); /* Standard Output */ #endif /* HAVE_SETMODE */ #endif /* O_BINARY */ } static const char * dtMsg(time_t const dateTime) { /*---------------------------------------------------------------------------- Text for the version message to indicate datetime 'dateTime'. -----------------------------------------------------------------------------*/ struct tm * const brokenTimeP = localtime(&dateTime); char buffer[100]; strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", brokenTimeP); return pm_strdup(buffer); } static void showVersion(void) { pm_message("Using libnetpbm from Netpbm Version: %s", NETPBM_VERSION); /* SOURCE_DATETIME is defined when the user wants a reproducible build, so wants the source code modification datetime instead of the build datetime in the object code. */ #if defined(SOURCE_DATETIME) { const char * const sourceDtMsg = dtMsg(SOURCE_DATETIME); pm_message("Built from source dated %s", sourceDtMsg); pm_strfree(sourceDtMsg); } #else #if defined(BUILD_DATETIME) { const char * const buildDtMsg = dtMsg(BUILD_DATETIME); pm_message("Built at %s", buildDtMsg); pm_strfree(buildDtMsg); } #endif #endif #if defined(COMPILED_BY) pm_message("Built by %s", COMPILED_BY); #endif #ifdef BSD pm_message( "BSD defined" ); #endif /*BSD*/ #ifdef SYSV pm_message( "SYSV defined" ); #endif /*SYSV*/ #ifdef MSDOS pm_message( "MSDOS defined" ); #endif /*MSDOS*/ #ifdef AMIGA pm_message( "AMIGA defined" ); #endif /* AMIGA */ { const char * rgbdef; pm_message( "RGB_ENV='%s'", RGBENV ); rgbdef = getenv(RGBENV); if( rgbdef ) pm_message( "RGBENV= '%s' (env vbl set to '%s')", RGBENV, rgbdef ); else pm_message( "RGBENV= '%s' (env vbl is unset)", RGBENV); } } static void showNetpbmHelp(const char progname[]) { /*---------------------------------------------------------------------------- Tell the user where to get help for this program, assuming it is a Netpbm program (a program that comes with the Netpbm package, as opposed to a program that just uses the Netpbm libraries). Tell him to go to the URL listed in the Netpbm configuration file. The Netpbm configuration file is the file named by the NETPBM_CONF environment variable, or /etc/netpbm if there is no such environment variable. If the configuration file doesn't exist or can't be read, or doesn't contain a DOCURL value, tell him to go to a hardcoded source for documentation. -----------------------------------------------------------------------------*/ const char * netpbmConfigFileName; FILE * netpbmConfigFile; char * docurl; if (getenv("NETPBM_CONF")) netpbmConfigFileName = getenv("NETPBM_CONF"); else netpbmConfigFileName = "/etc/netpbm"; netpbmConfigFile = fopen(netpbmConfigFileName, "r"); if (netpbmConfigFile == NULL) { pm_message("Unable to open Netpbm configuration file '%s'. " "Errno = %d (%s). " "Use the NETPBM_CONF environment variable " "to control the identity of the Netpbm configuration file.", netpbmConfigFileName,errno, strerror(errno)); docurl = NULL; } else { docurl = NULL; /* default */ while (!feof(netpbmConfigFile) && !ferror(netpbmConfigFile)) { char line[80+1]; fgets(line, sizeof(line), netpbmConfigFile); if (line[0] != '#') { sscanf(line, "docurl=%s", docurl); } } if (docurl == NULL) pm_message("No 'docurl=' line in Netpbm configuration file '%s'.", netpbmConfigFileName); fclose(netpbmConfigFile); } if (docurl == NULL) pm_message("We have no reliable indication of where the Netpbm " "documentation is, but try " "http://netpbm.sourceforge.net or email " "Bryan Henderson (bryanh@giraffe-data.com) for help."); else pm_message("This program is part of the Netpbm package. Find " "documentation for it at %s/%s\n", docurl, progname); } static void parseCommonOptions(int * const argcP, const char ** const argv, bool * const showMessagesP, bool * const showVersionP, bool * const showHelpP, bool * const plainOutputP) { unsigned int inCursor; unsigned int outCursor; *showMessagesP = true; /* initial assumption */ *showVersionP = false; /* initial assumption */ *showHelpP = false; /* initial assumption */ *plainOutputP = false; /* initial assumption */ for (inCursor = 1, outCursor = 1; inCursor < *argcP; ++inCursor) { if (strcaseeq(argv[inCursor], "-quiet") || strcaseeq(argv[inCursor], "--quiet")) *showMessagesP = false; else if (strcaseeq(argv[inCursor], "-version") || strcaseeq(argv[inCursor], "--version")) *showVersionP = true; else if (strcaseeq(argv[inCursor], "-help") || strcaseeq(argv[inCursor], "--help") || strcaseeq(argv[inCursor], "-?")) *showHelpP = true; else if (strcaseeq(argv[inCursor], "-plain") || strcaseeq(argv[inCursor], "--plain")) *plainOutputP = true; else argv[outCursor++] = argv[inCursor]; } *argcP = outCursor; } void pm_proginit(int * const argcP, const char ** const argv) { /*---------------------------------------------------------------------------- Do various initialization things that all programs in the Netpbm package, and programs that emulate such programs, should do. This includes processing global options. We scan argv[], which has *argcP elements, for common options and execute the functions for the ones we find. We remove the common options from argv[], updating *argcP accordingly. This includes calling 'pm_init' to initialize the Netpbm libraries. argv[] is intended to be the program's POSIX arguments (as passed to the program's main function). But note that POSIX arguments are modifiable and as such, the conventional way to declare them in a program is with "char **", as opposed to pm_proginit's "const char **". To avoid a compiler warning, the program has to use the unconventional "const char **" type in the declaration of its main function. (Alternatively, it can just cast it to const char ** later). 'pm_proginit' does not modify any argument strings. -----------------------------------------------------------------------------*/ const char * const progname = pm_arg0toprogname(argv[0]); /* points to static memory in this library */ bool showMessages; bool plain; bool justShowVersion; /* We're supposed to just show the version information, then exit the program. */ bool justShowHelp; /* We're supposed to just tell user where to get help, then exit the program. */ pm_init(progname, 0); parseCommonOptions(argcP, argv, &showMessages, &justShowVersion, &justShowHelp, &plain); pm_plain_output = plain ? 1 : 0; pm_setMessage(showMessages ? 1 : 0, NULL); if (justShowVersion) { showVersion(); exit(0); } else if (justShowHelp) { pm_error("Use 'man %s' for help.", progname); /* If we can figure out a way to distinguish Netpbm programs from other programs using the Netpbm libraries, we can do better here. */ if (0) showNetpbmHelp(progname); exit(0); } } void pm_setMessage(int const newState, int * const oldStateP) { if (oldStateP) *oldStateP = pm_showmessages; pm_showmessages = !!newState; } int pm_getMessage(void) { return pm_showmessages; } static void extractAfterLastSlash(const char * const fullPath, char * const retval, size_t const retvalSize) { char * slashPos; /* Chop any directories off the left end */ slashPos = strrchr(fullPath, '/'); if (slashPos == NULL) { strncpy(retval, fullPath, retvalSize-1); retval[retvalSize-1] = '\0'; } else { strncpy(retval, slashPos + 1, retvalSize-1); retval[retvalSize-1] = '\0'; } } static void chopOffExe(char * const arg) { /*---------------------------------------------------------------------------- Chop any .exe off the right end of 'arg'. -----------------------------------------------------------------------------*/ if (strlen(arg) >= 4 && strcmp(arg+strlen(arg)-4, ".exe") == 0) arg[strlen(arg)-4] = 0; } char * pm_arg0toprogname(const char arg0[]) { /*---------------------------------------------------------------------------- Given a value for argv[0] (a command name or file name passed to a program in the standard C calling sequence), return the name of the Netpbm program to which it refers. In the most ordinary case, this is simply the argument itself. But if the argument contains a slash, it is the part of the argument after the last slash, and if there is a .exe on it (as there is for DJGPP), that is removed. The return value is in static storage within. It is NUL-terminated, but truncated at 64 characters. -----------------------------------------------------------------------------*/ #define MAX_RETVAL_SIZE 64 #if MSVCRT /* Note that there exists _splitpath_s, which takes a size argument, but it is only in "secure" extensions of MSVCRT that come only with MSVC; but _splitpath() comes with Windows. MinGW has a header file for it. */ static char retval[_MAX_FNAME]; _splitpath(arg0, 0, 0, retval, 0); if (MAX_RETVAL_SIZE < _MAX_FNAME) retval[MAX_RETVAL_SIZE] = '\0'; #else static char retval[MAX_RETVAL_SIZE+1]; extractAfterLastSlash(arg0, retval, sizeof(retval)); chopOffExe(retval); #endif return retval; } unsigned int pm_randseed(void) { return time(NULL) ^ getpid(); } unsigned int pm_parse_width(const char * const arg) { /*---------------------------------------------------------------------------- Return the image width represented by the decimal ASCIIZ string 'arg'. Fail if it doesn't validly represent a width or represents a width that can't be conveniently used in computation. See comments at 'validateComputableSize' in libpam.c for details on the purpose of these validations. This isn't just for Netpbm format images. Typical places from which widths come: headers of non-Netpbm images; command line options. -----------------------------------------------------------------------------*/ unsigned int width; const char * error; pm_string_to_uint(arg, &width, &error); if (error) { pm_error("'%s' is invalid as an image width. %s", arg, error); pm_strfree(error); } else { if (width > INT_MAX-10) pm_error("Width %u is too large for computations.", width); if (width == 0) pm_error("Width argument must be a positive number. You " "specified 0."); } return width; } unsigned int pm_parse_height(const char * const arg) { /*---------------------------------------------------------------------------- Same as pm_parse_width(), but for height. -----------------------------------------------------------------------------*/ unsigned int height; const char * error; pm_string_to_uint(arg, &height, &error); if (error) { pm_error("'%s' is invalid as an image height. %s", arg, error); pm_strfree(error); } else { if (height > INT_MAX-10) pm_error("Height %u is too large for computations.", height); if (height == 0) pm_error("Height argument must be a positive number. You " "specified 0."); } return height; } unsigned int pm_parse_maxval(const char * const arg) { /*---------------------------------------------------------------------------- Same as pm_parse_width(), but for maxval. -----------------------------------------------------------------------------*/ unsigned int maxval; const char * error; pm_string_to_uint(arg, &maxval, &error); if (error) { pm_error("'%s' is invalid as a maxval. %s", arg, error); pm_strfree(error); } else { if (maxval > INT_MAX-1) pm_error("Maxval %u is too large for computations.", maxval); if (maxval == 0) pm_error("Maxval argument must be a positive number. You " "specified 0."); } return maxval; }