Fix 2018/algmyr to not segfault on NULL file

Now it just exits 1 if a file cannot be opened. I do have a concern with
this type of fix which I will bring up on GitHub but it seems better
anyway to not crash with invalid input unless the entry should crash.
The fact the author noted that invalid paths as a limitation suggests in
this case that it is reasonable to fix. There are other limitations /
bugs the author mentions but perhaps those should not be fixed. That
remains to be seen I guess.

I can also now confirm that this entry does indeed work as expected; I
could not test it with commit ced8177ef9
but I had to test it here to make sure the changes did not affect the
functionality.

The original source, which has a really nice layout, can be found in
prog.alt.c and is referenced in the README.md. It can be built by make
alt.

2018/algmyr/Makefile

@@ -115,8 +115,8 @@ CSRC= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 
 #################

2018/algmyr/README.md

@@ -17,6 +17,12 @@ cat prog.c | ./prog           # Printing garbage might break your font
 ./prog -d 2 0 out.raw         # Decode the first (0th) channel out of two
 ```
 
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) made this entry not
+crash when a file cannot be opened. The original file, kept for the wonderful
+format, is in [prog.alt.c](prog.alt.c). See below for details. Thank you Cody
+for your assistance!
+
+
 ## Try:
 
 ```sh
@@ -25,15 +31,29 @@ cat prog.c | ./prog           # Printing garbage might break your font
 # Who needs cat?
 ./prog prog.c | ./prog -d 1 0
 
-# Assuming ALSA
+# Assuming ALSA:
 echo '<<<<<<  /\_/\_/\  _-_-_-_  !!!!!  :.:.:.:  >>>>>> ****** ~~~~~~~' |
     ./prog | aplay -c1 -fFLOAT_LE -r44100
 
-# Assuming sox
+# Assuming sox:
 echo -n ' MENE MENE TEKEL UPHARSIN ' | ./prog | 
     sox -t raw -c 1 -r 44100 -L -e floating-point -b 32 - -n spectrogram -d 10 -X 300
+
+# now open spectrogram.png with a graphics viewer or editor
 ```
 
+### Alternate code:
+
+The original source which will crash if a file cannot be opened but which also
+has a nicer layout can be found in [prog.alt.c](prog.alt.c). Try:
+
+
+```sh
+make alt
+```
+
+Use `prog.alt` as you would `prog`.
+
 ## Judges' comments:
 
 Be warned, this is not your garden variety text-to-speech program! Earplugs are advised,

2018/algmyr/prog.alt.c

@@ -0,0 +1,66 @@
+#include<stdio.h>
+#include<stdlib.h>
+#define M malloc(sizeof(
+#define R fread(x,sizeof(float),Z*w,f)
+#define E free(
+
+char*G=
+"   "
+"    '"
+"@(*AP(  "
+"             "
+"                     "
+"                              "
+"                                        "
+"                                                   _"
+"0   #@ .  \"C^*/XH\"Q2_U(D&(5*E0C 4B54DV   X    \"!9A@   89H$ !"
+"0(/@@4 @(/@@(   #@T  @(\" @(    P, , P# , #Y1244^   ?R 0#%)14,A#9)24$B 1"
+"_)!0,$Y145%R Y145$^&!81T! #9)24DV#Y)24DP  ;&P     -C4 $$B% @ !04%!04 @4(D$ #!(1"
+"4 @#U574$^'^0D)!_&Z1D9'_$*!@8%^'Z!@8'_(&1D9'_(\"0D)#_%Z1D8%^/\\0$!#_ \"!_X$ /X! 0"
+"$&(-$*!#_ $! 0'_/] ,$#_/\\&&&#_'Z!@8%^&\"0D)#_'V\"A8%^&>8D)#_$Z1D9%B(\" _X\" /X"
+"! 0'^/ , PSP/P#' /\\,<H$\"C', @'R# ,&AD8F'(&!_P   ,,,,     _X&!! @0\" 0 "
+"$! 0$!  @0(   \\5%14\" X1$0G_!$1$1$./\\2$1$. T5%14. \"0D'\\ 'Y)"
+"144X \\0$ C_  !7Q     7A$! $2# 3_ $!_H   \\0'Q ? \\0"
+"$! ? X1$1$.#A$1\"1_'](1$0X @0$ @? (5%14)"
+"  1$?X0!\\\" 0$>!@& 088!X!#@$>"
+"!$*! H1#X)!04X!$9%1,1"
+"(&!;A 0   _P "
+" ! 0;H&!"
+" @$\""
+"! ("
+"\0";                            int s,p,e,c,t,r,a,l;   /* l e a k a g e */
+ 
+                                                     int
+                                                   F(int o
+                                                ,int n, int t
+                                             ){char*p=(o*(136-o)
+                                           >=1260)*7*(o-9)+G; for(
+                                          n=!(o=-1); n=*p+++64*n-*G
+                                        ,(o+=3)>>2<5-t; ); return 255
+                                       &n>>2*o%8; } float L[0x400];int
+                                     T(float a,float b,float l,float*e)
+                                    {return L[0x3ff]||!(e[1]=b*a+l**e)||
+                                   !T(l*a-b**e,b,l,e+1); } float f(int x)
+                                  {int w=s<<!!T(1,6.135885e-3,-1.882472e-5
+                                 +1,L); x=(x%w+w)%w<<9; return(L[x/s]*(s-x%
+                                s)+L[x/s+1]*(x%s))/s; } int C(float*h,float*
+                               i,int r,int P){ int x,y,c; for(y=0; h<i; ++y,h
+                               +=r){ c=P<1; for(*h=x=0; x<8; c+=(1&P>>x&&P+(*
+                              h+=f(e*(l+a*(2*x+1))*y)*f(s/2-e*a*y+e*a*y*y*(t/p
+                             )/(s/p)))),++x); float z=f(y*t)*f(y*t); *h=z*(1+3*
+                             z+2*z*z)/6**h/c; } return h-i-r+1; } void d(int w,
+                            int n,FILE*f){int Z=s/t; int S[5]; float**P=M float*
+                            )*c);for(r=0;r<c;++r){ P[r]=M float)*Z); C(P[r],P[r]
+                           +Z,1,r); } float*x=M float)*Z*w); for (; ; ){ for(r=0;
+                r<5        ; ++r){ int o=1; for(R,a=256; o&&--a; )for(o=t=0; t<Z;        o+=
+               P[a][       t]!=x[w*t+n],++t); S[r]=a; } if(R-Z*w)break; for(r=a= -      12;r<
+              5&&(a+=     a<11?22:1)<127; )for(r=-1; ++r<5&&F(a,1,r)==S[r]; );if(a     <127&&r
+    ==5      )putchar(    a); } for(; --c; E P[c])); E P); fclose(f);}int main(int    q,char**v)      {s=
+   44100     ;p=25; e=    55;c=256; t=75; r=q>1?v[1][0]*c+v[1][1]:0; a=7;l=16;if(r    ==11620){d     (atoi
+  (v[2]),   atoi(v[3]),  q<5?stdin:fopen(v[4],"r")); return 0; } char*H=malloc(c),*  h=H; sprintf   (H,"\0"
+ "Usage\n"  "    %s [-"  "h] [-d #c cid] file1 file2 ... (or stdin)"+(q-1&&r==11624  ),v[0]);if(*  H)q=1;int
+ w=2>q?1:q -1; FILE**f=M FILE*)*w); f[0]=stdin; if(q>1)for(r=0; r<w; f[r]=fopen(v[r +1],"r"),++r); int l=s/t
+ *w; float *b=M float)*l ),*t=b+l; int*i=M int)*w); for(; ; ){ int x=*h&&1>ungetc(* H++,*f); for(r =w; r--;)
+{ i[r]=getc (f[r]); if(i[r]<0)i[r]=!++x; } if(x==w)break; while(++r<6){ while(C(b++,t,w,F(*i++,r< 5,r))); i-=
+w; fwrite(b-=w,sizeof(float),l,stdout); } fflush(stdout); } while(fclose(f[--w]),w); E f); E b); E i); E h);}
+

2018/algmyr/prog.c

@@ -59,7 +59,7 @@ char*G=
    44100     ;p=25; e=    55;c=256; t=75; r=q>1?v[1][0]*c+v[1][1]:0; a=7;l=16;if(r    ==11620){d     (atoi
   (v[2]),   atoi(v[3]),  q<5?stdin:fopen(v[4],"r")); return 0; } char*H=malloc(c),*  h=H; sprintf   (H,"\0"
  "Usage\n"  "    %s [-"  "h] [-d #c cid] file1 file2 ... (or stdin)"+(q-1&&r==11624  ),v[0]);if(*  H)q=1;int
- w=2>q?1:q -1; FILE**f=M FILE*)*w); f[0]=stdin; if(q>1)for(r=0; r<w; f[r]=fopen(v[r +1],"r"),++r); int l=s/t
+ w=2>q?1:q-1;FILE**f=M FILE*)*w);f[0]=stdin;if(q>1)for(r=0;r<w;(((f[r]=fopen(v[r+1],"r"))||(exit(1),1))),++r); int l=s/t
  *w; float *b=M float)*l ),*t=b+l; int*i=M int)*w); for(; ; ){ int x=*h&&1>ungetc(* H++,*f); for(r =w; r--;)
 { i[r]=getc (f[r]); if(i[r]<0)i[r]=!++x; } if(x==w)break; while(++r<6){ while(C(b++,t,w,F(*i++,r< 5,r))); i-=
 w; fwrite(b-=w,sizeof(float),l,stdout); } fflush(stdout); } while(fclose(f[--w]),w); E f); E b); E i); E h);}