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-rw-r--r--libc/stdio/scanf.c536
1 files changed, 536 insertions, 0 deletions
diff --git a/libc/stdio/scanf.c b/libc/stdio/scanf.c
new file mode 100644
index 000000000..7c5f52183
--- /dev/null
+++ b/libc/stdio/scanf.c
@@ -0,0 +1,536 @@
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+
+#ifdef __STDC__
+#include <stdarg.h>
+#define va_strt va_start
+#else
+#include <varargs.h>
+#define va_strt(p,i) va_start(p)
+#endif
+
+#ifdef L_scanf
+#ifdef __STDC__
+int scanf(const char * fmt, ...)
+#else
+int scanf(fmt, va_alist)
+__const char *fmt;
+va_dcl
+#endif
+{
+ va_list ptr;
+ int rv;
+ va_strt(ptr, fmt);
+ rv = vfscanf(stdin,fmt,ptr);
+ va_end(ptr);
+ return rv;
+}
+#endif
+
+#ifdef L_sscanf
+#ifdef __STDC__
+int sscanf(char * sp, const char * fmt, ...)
+#else
+int sscanf(sp, fmt, va_alist)
+char * sp;
+__const char *fmt;
+va_dcl
+#endif
+{
+static FILE string[1] =
+{
+ {0, (char*)(unsigned) -1, 0, 0, (char*) (unsigned) -1, -1,
+ _IOFBF | __MODE_READ}
+};
+
+ va_list ptr;
+ int rv;
+ va_strt(ptr, fmt);
+ string->bufpos = sp;
+ rv = vfscanf(string,fmt,ptr);
+ va_end(ptr);
+ return rv;
+}
+#endif
+
+#ifdef L_fscanf
+#ifdef __STDC__
+int fscanf(FILE * fp, const char * fmt, ...)
+#else
+int fscanf(fp, fmt, va_alist)
+FILE * fp;
+__const char *fmt;
+va_dcl
+#endif
+{
+ va_list ptr;
+ int rv;
+ va_strt(ptr, fmt);
+ rv = vfscanf(fp,fmt,ptr);
+ va_end(ptr);
+ return rv;
+}
+#endif
+
+#ifdef L_vscanf
+int vscanf(fmt, ap)
+__const char *fmt;
+va_list ap;
+{
+ return vfscanf(stdin,fmt,ap);
+}
+#endif
+
+#ifdef L_vsscanf
+int vsscanf(sp, fmt, ap)
+char * sp;
+__const char *fmt;
+{
+static FILE string[1] =
+{
+ {0, (char*)(unsigned) -1, 0, 0, (char*) (unsigned) -1, -1,
+ _IOFBF | __MODE_READ}
+};
+
+ string->bufpos = sp;
+ return vfscanf(string,fmt,ap);
+}
+#endif
+
+#ifdef L_vfscanf
+
+#if FLOATS
+int _vfscanf_fp_ref = 1;
+#else
+int _vfscanf_fp_ref = 0;
+#endif
+
+/* #define skip() do{c=getc(fp); if (c<1) goto done;}while(isspace(c))*/
+
+#define skip() while(isspace(c)) { if ((c=getc(fp))<1) goto done; }
+
+#if FLOATS
+/* fp scan actions */
+#define F_NADA 0 /* just change state */
+#define F_SIGN 1 /* set sign */
+#define F_ESIGN 2 /* set exponent's sign */
+#define F_INT 3 /* adjust integer part */
+#define F_FRAC 4 /* adjust fraction part */
+#define F_EXP 5 /* adjust exponent part */
+#define F_QUIT 6
+
+#define NSTATE 8
+#define FS_INIT 0 /* initial state */
+#define FS_SIGNED 1 /* saw sign */
+#define FS_DIGS 2 /* saw digits, no . */
+#define FS_DOT 3 /* saw ., no digits */
+#define FS_DD 4 /* saw digits and . */
+#define FS_E 5 /* saw 'e' */
+#define FS_ESIGN 6 /* saw exp's sign */
+#define FS_EDIGS 7 /* saw exp's digits */
+
+#define FC_DIG 0
+#define FC_DOT 1
+#define FC_E 2
+#define FC_SIGN 3
+
+/* given transition,state do what action? */
+int fp_do[][NSTATE] = {
+ {F_INT,F_INT,F_INT,
+ F_FRAC,F_FRAC,
+ F_EXP,F_EXP,F_EXP}, /* see digit */
+ {F_NADA,F_NADA,F_NADA,
+ F_QUIT,F_QUIT,F_QUIT,F_QUIT,F_QUIT}, /* see '.' */
+ {F_QUIT,F_QUIT,
+ F_NADA,F_QUIT,F_NADA,
+ F_QUIT,F_QUIT,F_QUIT}, /* see e/E */
+ {F_SIGN,F_QUIT,F_QUIT,F_QUIT,F_QUIT,
+ F_ESIGN,F_QUIT,F_QUIT}, /* see sign */
+};
+/* given transition,state what is new state? */
+int fp_ns[][NSTATE] = {
+ {FS_DIGS,FS_DIGS,FS_DIGS,
+ FS_DD,FS_DD,
+ FS_EDIGS,FS_EDIGS,FS_EDIGS}, /* see digit */
+ {FS_DOT,FS_DOT,FS_DD,
+ }, /* see '.' */
+ {0,0,
+ FS_E,0,FS_E,
+ }, /* see e/E */
+ {FS_SIGNED,0,0,0,0,
+ FS_ESIGN,0,0}, /* see sign */
+};
+/* which states are valid terminators? */
+int fp_sval[NSTATE] = {
+ 0,0,1,0,1,0,0,1
+};
+#endif
+
+int
+vfscanf(fp, fmt, ap)
+register FILE *fp;
+register char *fmt;
+va_list ap;
+
+{
+ register long n;
+ register int c, width, lval, cnt = 0;
+ int store, neg, base, wide1, endnull, rngflag, c2;
+ register unsigned char *p;
+ unsigned char delim[128], digits[17], *q;
+#if FLOATS
+ long frac, expo;
+ int eneg, fraclen, fstate, trans;
+ double fx, fp_scan();
+#endif
+
+ if (!*fmt)
+ return (0);
+
+ c = getc(fp);
+ while (c > 0)
+ {
+ store = 0;
+ if (*fmt == '%')
+ {
+ n = 0;
+ width = -1;
+ wide1 = 1;
+ base = 10;
+ lval = (sizeof(long) == sizeof(int));
+ store = 1;
+ endnull = 1;
+ neg = -1;
+
+ strcpy(delim, "\011\012\013\014\015 ");
+ strcpy(digits, "0123456789ABCDEF");
+
+ if (fmt[1] == '*')
+ {
+ endnull = store = 0;
+ ++fmt;
+ }
+
+ while (isdigit(*++fmt))/* width digit(s) */
+ {
+ if (width == -1)
+ width = 0;
+ wide1 = width = (width * 10) + (*fmt - '0');
+ }
+ --fmt;
+ fmtnxt:
+ ++fmt;
+ switch (tolower(*fmt)) /* tolower() is a MACRO! */
+ {
+ case '*':
+ endnull = store = 0;
+ goto fmtnxt;
+
+ case 'l': /* long data */
+ lval = 1;
+ goto fmtnxt;
+ case 'h': /* short data */
+ lval = 0;
+ goto fmtnxt;
+
+ case 'i': /* any-base numeric */
+ base = 0;
+ goto numfmt;
+
+ case 'b': /* unsigned binary */
+ base = 2;
+ goto numfmt;
+
+ case 'o': /* unsigned octal */
+ base = 8;
+ goto numfmt;
+
+ case 'x': /* unsigned hexadecimal */
+ base = 16;
+ goto numfmt;
+
+ case 'd': /* SIGNED decimal */
+ neg = 0;
+ /* FALL-THRU */
+
+ case 'u': /* unsigned decimal */
+ numfmt:skip();
+
+ if (isupper(*fmt))
+ lval = 1;
+
+ if (!base)
+ {
+ base = 10;
+ neg = 0;
+ if (c == '%')
+ {
+ base = 2;
+ goto skip1;
+ }
+ else if (c == '0')
+ {
+ c = getc(fp);
+ if (c < 1)
+ goto savnum;
+ if ((c != 'x')
+ && (c != 'X'))
+ {
+ base = 8;
+ digits[8] = '\0';
+ goto zeroin;
+ }
+ base = 16;
+ goto skip1;
+ }
+ }
+
+ if ((neg == 0) && (base == 10)
+ && ((neg = (c == '-')) || (c == '+')))
+ {
+ skip1:
+ c = getc(fp);
+ if (c < 1)
+ goto done;
+ }
+
+ digits[base] = '\0';
+ p = ((unsigned char *)
+ strchr(digits, toupper(c)));
+
+ if ((!c || !p) && width)
+ goto done;
+
+ while (p && width-- && c)
+ {
+ n = (n * base) + (p - digits);
+ c = getc(fp);
+ zeroin:
+ p = ((unsigned char *)
+ strchr(digits, toupper(c)));
+ }
+ savnum:
+ if (store)
+ {
+ if (neg == 1)
+ n = -n;
+ if (lval)
+ *va_arg(ap, long*) = n;
+ else
+ *va_arg(ap, short*) = n;
+ ++cnt;
+ }
+ break;
+
+#if FLOATS
+ case 'e': /* float */
+ case 'f':
+ case 'g':
+ skip();
+ fprintf(stderr,"LIBM:SCANF");
+
+ if (isupper(*fmt))
+ lval = 1;
+
+ fstate = FS_INIT;
+ neg = 0;
+ eneg = 0;
+ n = 0;
+ frac = 0;
+ expo = 0;
+ fraclen = 0;
+
+ while (c && width--)
+ {
+ if (c >= '0' && c <= '9')
+ trans = FC_DIG;
+ else if (c == '.')
+ trans = FC_DOT;
+ else if (c == '+' || c == '-')
+ trans = FC_SIGN;
+ else if (tolower(c) == 'e')
+ trans = FC_E;
+ else
+ goto fdone;
+
+ switch (fp_do[trans][fstate])
+ {
+ case F_SIGN:
+ neg = (c == '-');
+ break;
+ case F_ESIGN:
+ eneg = (c == '-');
+ break;
+ case F_INT:
+ n = 10 * n + (c - '0');
+ break;
+ case F_FRAC:
+ frac = 10 * frac + (c - '0');
+ fraclen++;
+ break;
+ case F_EXP:
+ expo = 10 * expo + (c - '0');
+ break;
+ case F_QUIT:
+ goto fdone;
+ }
+ fstate = fp_ns[trans][fstate];
+ c = getc(fp);
+ }
+
+ fdone:
+ if (!fp_sval[fstate])
+ goto done;
+ if (store)
+ {
+ fx = fp_scan(neg, eneg, n, frac, expo, fraclen);
+ if (lval)
+ *va_arg(ap, double *) = fx;
+ else
+ *va_arg(ap, float *) = fx;
+ ++cnt;
+ }
+ break;
+#else
+ case 'e': /* float */
+ case 'f':
+ case 'g':
+ fprintf(stderr, "LIBC:SCANF");
+ exit(-1);
+#endif
+
+ case 'c': /* character data */
+ width = wide1;
+ lval = endnull = 0;
+ delim[0] = '\0';
+ goto strproc;
+
+ case '[': /* string w/ delimiter set */
+
+ /* get delimiters */
+ p = delim;
+
+ if (*++fmt == '^')
+ {
+ fmt++;
+ lval = 0;
+ }
+ else
+ lval = 1;
+
+ rngflag = 2;
+ if ((*fmt == ']') || (*fmt == '-'))
+ {
+ *p++ = *fmt++;
+ rngflag = 0;
+ }
+
+ while (*fmt != ']')
+ {
+ if (*fmt == '\0')
+ goto done;
+ switch (rngflag)
+ {
+ case 1:
+ c2 = *(p - 2);
+ if (c2 <= *fmt)
+ {
+ p -= 2;
+ while (c2 < *fmt)
+ *p++ = c2++;
+ rngflag = 2;
+ break;
+ }
+ /* fall thru intentional */
+
+ case 0:
+ rngflag = (*fmt == '-');
+ break;
+
+ case 2:
+ rngflag = 0;
+ }
+
+ *p++ = *fmt++;
+ }
+
+ *p = '\0';
+ goto strproc;
+
+ case 's': /* string data */
+ lval = 0;
+ skip();
+ strproc:
+ /* process string */
+ p = va_arg(ap, unsigned char *);
+
+ /* if the 1st char fails, match fails */
+ if (width)
+ {
+ q = ((unsigned char *)
+ strchr(delim, c));
+ if ((c < 1) || lval == (q==0))
+ {
+ if (endnull)
+ *p = '\0';
+ goto done;
+ }
+ }
+
+ for (;;) /* FOREVER */
+ {
+ if (store)
+ *p++ = c;
+ if (((c = getc(fp)) < 1) ||
+ (--width == 0))
+ break;
+
+ q = ((unsigned char *)
+ strchr(delim, c));
+ if (lval == (q==0))
+ break;
+ }
+
+ if (store)
+ {
+ if (endnull)
+ *p = '\0';
+ ++cnt;
+ }
+ break;
+
+ case '\0': /* early EOS */
+ --fmt;
+ /* FALL THRU */
+
+ default:
+ goto cmatch;
+ }
+ }
+ else if (isspace(*fmt)) /* skip whitespace */
+ {
+ skip();
+ }
+ else
+ { /* normal match char */
+ cmatch:
+ if (c != *fmt)
+ break;
+ c = getc(fp);
+ }
+
+ if (!*++fmt)
+ break;
+ }
+
+ done: /* end of scan */
+ if ((c == EOF) && (cnt == 0))
+ return (EOF);
+
+ if( c != EOF )
+ ungetc(c, fp);
+ return (cnt);
+}
+
+#endif
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