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dtb 2024-01-15 13:24:52 -07:00
parent eae95ebfca
commit a164619397
2 changed files with 327 additions and 0 deletions

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Wip/mm/Makefile Normal file
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mm: mm.c

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Wip/mm/mm.c Normal file
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#include <errno.h> /* errno */
#include <stdio.h> /* fclose(3), fopen(3), fprintf(3), getc(3), putc(3),
* setvbuf(3), size_t, _IONBF, NULL */
#include <stdlib.h> /* free(3), realloc(3) */
#include <string.h> /* strerror(3) */
#include <unistd.h> /* getopt(3) */
#if !defined EX_OK || !defined EX_USAGE
# include <sysexits.h>
#endif
struct Io_ex{
size_t s;
FILE **files;
char **names;
};
struct Io{
size_t s;
FILE *files[10];
char *names[10];
char *fmode;
struct Io_ex *ex;
};
static char *program_name = "<no argv[0]>";
static char *stdin_name = "<stdin>";
static char *stdout_name = "<stdout>";
static char *stderr_name = "<stderr>";
static char *rmode = "rb";
static char *wmode = "rb+";
static char *wharsh = "wb";
#define terminate(io) do{ \
Io_destruct(&(io)[0]); \
Io_destruct(&(io)[1]); }while(0)
static struct Io *
Io_construct(struct Io *io){
io->s = 0;
io->ex->s = 0;
io->ex->files = NULL;
io->ex->names = NULL;
return io;
}
static struct Io *
Io_destruct(struct Io *io){
size_t i;
for(i = 0; i < io->s; ++i)
fclose(io->files[i]);
for(i = 0; i < io->ex->s; ++i)
fclose(io->ex->files[i]);
free(io->ex->files);
free(io->ex->names);
return Io_construct(io); /* counter-intuitive but NULLs and 0s */
}
static FILE *
Io_fappend(struct Io *io, FILE *f, char *s){
if(io->s == -1)
io->s = 0;
if(io->s < (sizeof (io->files)) / (sizeof *(io->files))){
io->names[io->s] = s;
return io->files[io->s++] = f;
}else{
io->ex->files = realloc(io->ex->files,
(sizeof *(io->ex->files)) * ++io->ex->s);
io->ex->names = realloc(io->ex->names,
(sizeof *(io->ex->names)) * io->ex->s);
io->ex->names[io->ex->s] = s;
return io->ex->files[io->ex->s++] = f;
}
}
static int
Io_fileindex(struct Io *io, FILE *f){
size_t i;
for(i = 0; i < io->s; ++i)
if(io->files[i] == f)
return i;
for(i = 0; i < io->ex->s; ++i)
if(io->ex->files[i] == f)
return i + io->s;
return -1;
}
static char *
Io_filename(struct Io *io, FILE *f){
int i;
if((i = Io_fileindex(io, f)) == -1)
return NULL;
else if(i < io->s - 1)
return io->names[i];
else
return io->ex->names[i - io->s];
}
static FILE *
Io_fopen(struct Io *io, char *s){
FILE *f;
if((f = fopen(s, io->fmode)) == NULL)
return NULL;
else
return Io_fappend(io, f, s);
}
static struct Io *Io_fremove(struct Io *io, FILE *f);
static FILE *Io_nextfile(struct Io *io, FILE *f);
static int
Io_fputc(struct Io *io, int c){
FILE *f;
FILE *lf;
char *ln;
f = NULL;
lf = NULL;
while((f = Io_nextfile(io, f)) != NULL){
if(lf != NULL){
if(fclose(lf) == EOF)
fprintf(stderr, "%s: %s: %s\n",
program_name, ln, strerror(errno));
Io_fremove(io, lf);
if(io->s == 0)
return EOF;
lf = NULL;
}
if(putc(c, f) == EOF){
lf = f;
ln = Io_filename(io, lf);
}
}
return c;
}
static struct Io *
Io_fremove(struct Io *io, FILE *f){
size_t i;
for(i = 0; i < io->s && io->files[i] != f; ++i);
if(io->files[i] == f){
for( ; i < io->s - 1; ++i){
io->files[i] = io->files[i + 1];
io->names[i] = io->names[i + 1];
}
if(io->ex->s > 0){
io->files[io->s] = io->ex->files[0];
io->names[io->s] = io->ex->names[0];
}else{
--io->s;
return io;
}
i = 0;
}else{
for(i = 0; i < io->ex->s && io->ex->files[i] != f; ++i);
if(io->ex->files[i] != f)
return NULL;
}
for( ; i < io->ex->s - 1; ++i){
io->ex->files[i] = io->ex->files[i + 1];
io->ex->names[i] = io->ex->names[i + 1];
}
--io->ex->s;
return io;
}
static FILE *
Io_nextfile(struct Io *io, FILE *f){
size_t i;
if(f == NULL)
return io->files[0];
for(i = 0; i < io->s; ++i)
if(io->files[i] == f){
if(i == io->s - 1 && io->ex->s == 0)
return NULL;
else if(i == io->s - 1)
return io->ex->files[0];
else
return io->files[i + 1];
}
for(i = 0; i < io->ex->s; ++i)
if(io->ex->files[i] == f){
if(i == io->ex->s - 1)
break;
else
return io->ex->files[i + 1];
}
return NULL;
}
static struct Io *
Io_unbuffer(struct Io *io){
size_t i;
for(i = 0; i < io->s; ++i)
setvbuf(io->files[i], NULL, _IONBF, 0);
for(i = 0; i < io->ex->s; ++i)
setvbuf(io->ex->files[i], NULL, _IONBF, 0);
return io;
}
static int
oserr(char *s, char *r){
fprintf(stderr, "%s: %s: %s\n", s, r, strerror(errno));
return EX_OSERR;
}
static int
usage(char *s){
fprintf(stderr, "Usage: %s (-ehu) (-i [input])... (-o [output])...\n",
s);
return EX_USAGE;
}
int main(int argc, char *argv[]){
int c;
FILE *f;
size_t i;
struct Io io[2]; /* {read, write, error} */
struct Io_ex io_ex[2];
FILE *lf;
char *ln;
char unbuffered;
if(argc < 2){ /* simple invocation */
while((c = getc(stdin)) != EOF)
if(putc(c, stdout) == EOF)
break;
return EX_OK;
}
io[0].ex = &io_ex[0];
io[1].ex = &io_ex[1];
Io_construct(&io[0]);
Io_construct(&io[1]);
io[0].fmode = rmode;
io[1].fmode = wmode;
Io_fappend(&io[0], stdin, stdin_name);
Io_fappend(&io[1], stdout, stdout_name);
io[0].s = -1;
io[1].s = -1;
unbuffered = 0;
while((c = getopt(argc, argv, "ehi:o:u")) != -1)
switch(c){
case 'e':
Io_fappend(&io[1], stderr, stderr_name);
break;
case 'i': case 'o':
if(optarg[0] == '-' && optarg[1] == '\0'){
/* "-" */
Io_fappend(&io[c == 'o'],
c == 'i' ? stdin : stdout,
c == 'i' ? stdin_name : stdout_name);
break;
}else if(Io_fopen(&io[c == 'o'], optarg)
!= NULL)
break;
/* does not exist, so try to create it */
if(c == 'o' && errno == ENOENT){
io[1].fmode = wharsh;
if(Io_fopen(&io[1], optarg) != NULL){
io[1].fmode = wmode;
break;
}
}
terminate(io);
return oserr(argv[0], optarg);;
case 'u':
unbuffered = 1;
break;
default:
terminate(io);
return usage(argv[0]);
}
if(unbuffered){
Io_unbuffer(&io[0]);
Io_unbuffer(&io[1]);
}
if(io[0].s == -1)
io[0].s = 1;
if(io[1].s == -1)
io[1].s = 1;
lf = NULL;
for(i = 0; i < io[0].s; ++i){
while((c = getc(io[0].files[i])) != EOF)
if(Io_fputc(&io[1], c) == EOF){ /* notebook's full */
terminate(io);
return EX_OK;
}
}
terminate(io);
return EX_OK;
}