C, 2,2 * 10 ^ 177 programas
#define S(s)char*q=#s,n[]="#####################################################################################################";i;s
S(main(){while(n[i]==91)n[i++]=35;i==101?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
Não é perfeito, mas muito bom. Quero dizer, é exatamente 255bytes de comprimento e gera programas do mesmo comprimento. Você provavelmente poderia mexer um pouco mais para ganhar mais alguns programas, mas vou deixar como está por enquanto.
O programa é baseado em uma simples coluna C. Além disso, existe um algoritmo de contagem bastante simples que conta com todos os valores possíveis da matriz char n. Temos tantos programas quanto permutações da string n.
O intervalo de caracteres é limitado a um intervalo de #(= 35) a [= (91). Isso porque eu não quero nenhum "ou \na cadeia, porque eles precisam ser escapados.
A geração do programa termina quando todos os valores na matriz char nsão [. Em seguida, ele gera um programa fictício simples main(){}, que por si só não gera nada.
#define S(s) char *q = #s; /* have the source as a string */ \
char n[] = "#####################################################################################################"; \
int i; \
s /* the source itself */
S(main() {
while(n[i]=='[') /* clear out highest value, so next array element be incremented */
n[i++]='#';
i==101 /* end of array reached? output dummy program */
? q = "main(){}"
: n[i]++; /* count one up in the whole array */
printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)", n, q);
})
Como demonstração de que deveria funcionar, mudei os limites, apenas caracteres entre o Código ASCII 35e 36são usados e apenas 4 elementos de matriz.
Os programas resultantes são
% echo > delim; find -iname 'program_*.c' | xargs -n1 cat delim
#define S(s)char*q=#s,n[]="####";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="$###";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="#$##";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="$$##";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="##$#";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="$#$#";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="#$$#";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="$$$#";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="###$";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="$##$";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="#$#$";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="$$#$";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="##$$";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="$#$$";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="#$$$";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="$$$$";i;s
S(main(){while(n[i]==36)n[i++]=35;i==4?q="main(){}":n[i]++;printf("#define S(s)char*q=#s,n[]=\"%s\";i;s\nS(%s)",n,q);})
#define S(s)char*q=#s,n[]="####";i;s
S(main(){})
Isso gera 2^4 + 1 = 17diferentes programas.
Portanto, o programa acima gera ((91-35)+1)^101 + 1 = 57^101 + 1 ~= 2.2 * 10^177diferentes programas. Não tenho muita certeza se isso conta ou se meu cálculo está correto
2^2048, ou3.2317e616.