79 #define _throw(m) {__bmperr=m;  retcode=-1;  goto finally;}  macro
80 #define _unix(f) {if((f)==-1) _throw(strerror(errno));}
84 	if((bytesread=read(fd, addr, (size)))==-1) _throw(strerror(errno)); \
85 	if(bytesread!=(size)) _throw("Read error");
115 	if((fs=fdopen(*fd, "r"))==NULL) _throw(strerror(errno));  in loadppm()
119 		if(!fgets(temps, 255, fs)) _throw("Read error");  in loadppm()
126 					_throw("Read error");  in loadppm()
130 					_throw("Read error");  in loadppm()
134 					_throw("Read error");  in loadppm()
139 	if((*w)<1 || (*h)<1 || scalefactor<1) _throw("Corrupt PPM header");  in loadppm()
143 		_throw("Memory allocation error");  in loadppm()
151 					_throw("Read error");  in loadppm()
161 			_throw("Binary PPMs must have 8-bit components");  in loadppm()
163 			_throw("Memory allocation error");  in loadppm()
164 		if(fread(tempbuf, (*w)*(*h)*3, 1, fs)!=1) _throw("Read error");  in loadppm()
188 		_throw("invalid argument to loadbmp()");  in loadbmp()
190 		_throw("Alignment must be a power of 2");  in loadbmp()
242 		_throw("Corrupt bitmap header");  in loadbmp()
244 		_throw("Only uncompessed RGB bitmaps are supported");  in loadbmp()
251 	if(srcpitch*(*h)+bh.bfOffBits!=bh.bfSize) _throw("Corrupt bitmap header");  in loadbmp()
254 		_throw("Memory allocation error");  in loadbmp()
256 		_throw(strerror(errno));  in loadbmp()
258 	if(bytesread!=srcpitch*(*h)) _throw("Read error");  in loadbmp()
270 	if((byteswritten=write(fd, addr, (size)))==-1) _throw(strerror(errno)); \
271 	if(byteswritten!=(size)) _throw("Write error");
279 	if((fs=fopen(filename, "wb"))==NULL) _throw(strerror(errno));  in saveppm()
280 	if(fprintf(fs, "P6\n")<1) _throw("Write error");  in saveppm()
281 	if(fprintf(fs, "%d %d\n", w, h)<1) _throw("Write error");  in saveppm()
282 	if(fprintf(fs, "255\n")<1) _throw("Write error");  in saveppm()
285 		_throw("Memory allocation error");  in saveppm()
290 	if((fwrite(tempbuf, w*h*3, 1, fs))!=1) _throw("Write error");  in saveppm()
312 		_throw("bad argument to savebmp()");  in savebmp()
372 		_throw("Memory allocation error");  in savebmp()
378 		_throw(strerror(errno));  in savebmp()