#include "libc/calls/calls.h"
#include "libc/fmt/fmt.h"
#include "libc/mem/mem.h"
#include "libc/stdio/stdio.h"
#include "libc/stdio/temp.h"
#include "libc/str/str.h"
#include "third_party/f2c/f2c.h"
#include "third_party/f2c/fio.h"

#ifdef KR_headers
extern char *malloc();
#ifdef NON_ANSI_STDIO
extern char *mktemp();
#endif
extern integer f_clos();
#define Const /*nothing*/
#else
#define Const const
#undef abs
#undef min
#undef max
#ifdef __cplusplus
extern "C" {
#endif
extern int f__canseek(FILE *);
extern integer f_clos(cllist *);
#endif

#ifdef NON_ANSI_RW_MODES
Const char *f__r_mode[2] = {"r", "r"};
Const char *f__w_mode[4] = {"w", "w", "r+w", "r+w"};
#else
Const char *f__r_mode[2] = {"rb", "r"};
Const char *f__w_mode[4] = {"wb", "w", "r+b", "r+"};
#endif

static char f__buf0[400], *f__buf = f__buf0;
int f__buflen = (int)sizeof(f__buf0);

static void
#ifdef KR_headers
    f__bufadj(n, c) int n,
    c;
#else
f__bufadj(int n, int c)
#endif
{
  unsigned int len;
  char *nbuf, *s, *t, *te;

  if (f__buf == f__buf0) f__buflen = 1024;
  while (f__buflen <= n) f__buflen <<= 1;
  len = (unsigned int)f__buflen;
  if (len != f__buflen || !(nbuf = (char *)malloc(len)))
    f__fatal(113, "malloc failure");
  s = nbuf;
  t = f__buf;
  te = t + c;
  while (t < te) *s++ = *t++;
  if (f__buf != f__buf0) free(f__buf);
  f__buf = nbuf;
}

int
#ifdef KR_headers
    f__putbuf(c) int c;
#else
f__putbuf(int c)
#endif
{
  char *s, *se;
  int n;

  if (f__hiwater > f__recpos) f__recpos = f__hiwater;
  n = f__recpos + 1;
  if (n >= f__buflen) f__bufadj(n, f__recpos);
  s = f__buf;
  se = s + f__recpos;
  if (c) *se++ = c;
  *se = 0;
  for (;;) {
    fputs(s, f__cf);
    s += strlen(s);
    if (s >= se) break; /* normally happens the first time */
    putc(*s++, f__cf);
  }
  return 0;
}

void
#ifdef KR_headers
x_putc(c)
#else
x_putc(int c)
#endif
{
  if (f__recpos >= f__buflen) f__bufadj(f__recpos, f__buflen);
  f__buf[f__recpos++] = c;
}

#define opnerr(f, m, s) \
  {                     \
    if (f)              \
      errno = m;        \
    else                \
      opn_err(m, s, a); \
    return (m);         \
  }

static void
#ifdef KR_headers
    opn_err(m, s, a) int m;
char *s;
olist *a;
#else
opn_err(int m, const char *s, olist *a)
#endif
{
  if (a->ofnm) {
    /* supply file name to error message */
    if (a->ofnmlen >= f__buflen) f__bufadj((int)a->ofnmlen, 0);
    g_char(a->ofnm, a->ofnmlen, f__curunit->ufnm = f__buf);
  }
  f__fatal(m, s);
}

#ifdef KR_headers
integer f_open(a) olist *a;
#else
integer f_open(olist *a)
#endif
{
  unit *b;
  integer rv;
  char buf[256], *s;
  cllist x;
  int ufmt;
  FILE *tf;
#ifndef NON_UNIX_STDIO
  int n;
#endif
  f__external = 1;
  if (a->ounit >= MXUNIT || a->ounit < 0)
    err(a->oerr, 101, "open") if (!f__init) f_init();
  f__curunit = b = &f__units[a->ounit];
  if (b->ufd) {
    if (a->ofnm == 0) {
    same:
      if (a->oblnk) b->ublnk = *a->oblnk == 'z' || *a->oblnk == 'Z';
      return (0);
    }
#ifdef NON_UNIX_STDIO
    if (b->ufnm && strlen(b->ufnm) == a->ofnmlen &&
        !strncmp(b->ufnm, a->ofnm, (unsigned)a->ofnmlen))
      goto same;
#else
    g_char(a->ofnm, a->ofnmlen, buf);
    if (f__inode(buf, &n) == b->uinode && n == b->udev) goto same;
#endif
    x.cunit = a->ounit;
    x.csta = 0;
    x.cerr = a->oerr;
    if ((rv = f_clos(&x)) != 0) return rv;
  }
  b->url = (int)a->orl;
  b->ublnk = a->oblnk && (*a->oblnk == 'z' || *a->oblnk == 'Z');
  if (a->ofm == 0) {
    if (b->url > 0)
      b->ufmt = 0;
    else
      b->ufmt = 1;
  } else if (*a->ofm == 'f' || *a->ofm == 'F')
    b->ufmt = 1;
  else
    b->ufmt = 0;
  ufmt = b->ufmt;
#ifdef url_Adjust
  if (b->url && !ufmt) url_Adjust(b->url);
#endif
  if (a->ofnm) {
    g_char(a->ofnm, a->ofnmlen, buf);
    if (!buf[0]) opnerr(a->oerr, 107, "open")
  } else
    sprintf(buf, "fort.%ld", (long)a->ounit);
  b->uscrtch = 0;
  b->uend = 0;
  b->uwrt = 0;
  b->ufd = 0;
  b->urw = 3;
  switch (a->osta ? *a->osta : 'u') {
    case 'o':
    case 'O':
#ifdef NON_POSIX_STDIO
      if (!(tf = FOPEN(buf, "r"))) opnerr(a->oerr, errno, "open") fclose(tf);
#else
      if (access(buf, 0))
        opnerr(a->oerr, errno, "open")
#endif
      break;
    case 's':
    case 'S':
      b->uscrtch = 1;
#ifdef NON_ANSI_STDIO
      (void)strcpy(buf, "tmp.FXXXXXX");
      (void)mktemp(buf);
      goto replace;
#else
      if (!(b->ufd = tmpfile())) opnerr(a->oerr, errno, "open") b->ufnm = 0;
#ifndef NON_UNIX_STDIO
      b->uinode = b->udev = -1;
#endif
      b->useek = 1;
      return 0;
#endif

    case 'n':
    case 'N':
#ifdef NON_POSIX_STDIO
      if ((tf = FOPEN(buf, "r")) || (tf = FOPEN(buf, "a"))) {
        fclose(tf);
        opnerr(a->oerr, 128, "open")
      }
#else
      if (!access(buf, 0))
        opnerr(a->oerr, 128, "open")
#endif
      /* no break */
    case 'r': /* Fortran 90 replace option */
    case 'R':
#ifdef NON_ANSI_STDIO
    replace:
#endif
      if (tf = fopen(buf, f__w_mode[0])) fclose(tf);
  }

  b->ufnm = (char *)malloc((unsigned int)(strlen(buf) + 1));
  if (b->ufnm == NULL) opnerr(a->oerr, 113, "no space");
  (void)strcpy(b->ufnm, buf);
  if ((s = a->oacc) && b->url) ufmt = 0;
  if (!(tf = fopen(buf, f__w_mode[ufmt | 2]))) {
    if (tf = fopen(buf, f__r_mode[ufmt]))
      b->urw = 1;
    else if (tf = fopen(buf, f__w_mode[ufmt])) {
      b->uwrt = 1;
      b->urw = 2;
    } else
      err(a->oerr, errno, "open");
  }
  b->useek = f__canseek(b->ufd = tf);
#ifndef NON_UNIX_STDIO
  if ((b->uinode = f__inode(buf, &b->udev)) == -1)
    opnerr(a->oerr, 108, "open")
#endif
        if (b->useek) if (a->orl) rewind(b->ufd);
  else if ((s = a->oacc) && (*s == 'a' || *s == 'A') &&
           fseek(b->ufd, 0L, SEEK_END))
    opnerr(a->oerr, 129, "open");
  return (0);
}

int
#ifdef KR_headers
    fk_open(seq, fmt, n) ftnint n;
#else
fk_open(int seq, int fmt, ftnint n)
#endif
{
  char nbuf[10];
  olist a;
  (void)sprintf(nbuf, "fort.%ld", (long)n);
  a.oerr = 1;
  a.ounit = n;
  a.ofnm = nbuf;
  a.ofnmlen = strlen(nbuf);
  a.osta = NULL;
  a.oacc = (char *)(seq == SEQ ? "s" : "d");
  a.ofm = (char *)(fmt == FMT ? "f" : "u");
  a.orl = seq == DIR ? 1 : 0;
  a.oblnk = NULL;
  return (f_open(&a));
}
#ifdef __cplusplus
}
#endif