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Made a much better vbprintf()

This commit is contained in:
Julian Barathieu 2019-04-04 20:17:50 +02:00
parent b009b6b3c6
commit cd66216847
4 changed files with 225 additions and 228 deletions
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2
Makefile
View File

@ -178,7 +178,7 @@ $(KOBJDIR)/kernel/bput.o: $(KERNELDIR)/kernel/buf/bput.c $(KERNELDIR)/include/*/
$(KOBJDIR)/kernel/bprint.o: $(KERNELDIR)/kernel/buf/bprint.c $(KERNELDIR)/include/*/*.h
@$(KCC) $< -o $@
@echo ${CL2}[$@] ${CL}Compiled.${CL3}
$(KOBJDIR)/kernel/sched.o: $(KERNELDIR)/kernel/proc/sched.c $(KERNELDIR)/include/*/*.h
$(KOBJDIR)/kernel/sched.o: $(KERNELDIR)/kernel/ps/sched.c $(KERNELDIR)/include/*/*.h
@$(KCC) $< -o $@
@echo ${CL2}[$@] ${CL}Compiled.${CL3}

2
README.md
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@ -25,7 +25,7 @@ apt update && apt upgrade
apt install grub-pc dosfstools make nasm qemu
```
You also need to have the [x86-64 ELF gcc cross-compiler](https://www.os-k.eu/build-tools/cross-cc.tar.xz) in `/opt/cross-cc`.
You also need to have the [x86-64 ELF gcc cross-compiler](https://www.os-k.eu/build-tools/cross-cc.tar.xz) and its "bin" repertory in your PATH.
To compile, simply use at the root of this project :
```

189
kaleid/kernel/buf/bprint.c
View File

@ -87,13 +87,7 @@ static error_t bdopadding(Buffer_t *buf, size_t width, size_t len,
return rc;
}
#define bdoconvrt(pref, type, vtype) do { \
type i_##type = (type)va_arg(ap, vtype); \
pref##toa(i_##type, s, base); \
} while (0)
// Increase fmt while parsing a modifier
#define fmtnext() do{fmt++;if(*fmt==0){rc=EINVAL;goto leave;}}while(0)
#define CONVBUFSIZE 100
//
// Actually does BPrintOnBuf's job; doesn't lock anything
@ -101,17 +95,16 @@ static error_t bdopadding(Buffer_t *buf, size_t width, size_t len,
//
error_t vbprintf(Buffer_t *buf, const char *fmt, va_list ap)
{
error_t rc = EOK;
int tmpwidth;
size_t width;
error_t rc = 0;
int width, prec, len;
char type;
uchar uch;
char *s;
// Conversion buffer
char convbuf[100];
size_t len;
char convbuf[CONVBUFSIZE];
// Flags
int plus, minus, space, zero, hash;
@ -135,123 +128,120 @@ error_t vbprintf(Buffer_t *buf, const char *fmt, va_list ap)
return EBADF;
}
//----------------------------------------------------------------------------//
// We come back here after dealing with a modifier
loop:
// Progress in format string
while (*fmt && !rc) {
// Deal with all non-'%' characters
for (; *fmt && *fmt != '%' ; fmt++) {
if (*fmt != '%') {
rc = bputc(buf, *fmt);
fmt++;
continue;
}
// Job's done / something bad happened
if (rc || !*fmt) goto leave;
//----------------------------------------------------------------------------//
//
// %[parameter][flags][width|*][.precision][length]type
// We aren't dealing with parameters and float stuff just yet
// %[parameter][flags][width|*][.precision|*][length]type
// We aren't dealing with parameters and floating stuff just yet
//
// Skip the '%'
fmtnext();
fmt++;
// "%%" modifier
if (*fmt == '%') {
rc = bputc(buf, '%');
if (rc > 0) goto leave;
else {
fmt++;
goto loop;
}
continue;
}
// Reset everything
width = 0;
cap = sgn = 0;
l = h = hh = 0;
width = prec = 0;
plus = minus = space = zero = hash = 0;
//----------------------------------------------------------------------------//
//
// Flags field
//
while (1) {
if (*fmt == '#') hash++;
else if (*fmt == '0') zero++;
else if (*fmt == '+') plus++;
else if (*fmt == '-') minus++;
else if (*fmt == ' ') space++;
while (*fmt) {
if (*fmt == '#') { fmt++; hash++; }
else if (*fmt == '0') { fmt++; zero++; }
else if (*fmt == '+') { fmt++; plus++; }
else if (*fmt == '-') { fmt++; minus++; }
else if (*fmt == ' ') { fmt++; space++; }
// Next field
else break;
fmtnext();
}
//----------------------------------------------------------------------------//
//
// Width field
// Width & precision fields
// A width field of zero is ignored
//
// '*' means we should extract it from the argument list
if (*fmt == '*') {
fmtnext();
tmpwidth = va_arg(ap, int);
// Extracts either width or precision
#define bextractwp(name) \
do { \
if (*fmt == '*') { \
fmt++; \
name = va_arg(ap, int); \
} else { \
while (isdigit(*fmt) && name < CONVBUFSIZE) { \
name = 10 * name + (*fmt - '0'); \
fmt++; \
} \
} \
} while (0)
// Extract width
bextractwp(width);
// A width below 0 activates the "minus" flag
if (tmpwidth < 0) {
width = -tmpwidth;
if (width < 0) {
width = -width;
minus++;
} else {
width = tmpwidth;
}
} else {
// Extract width field from fmt
while (isdigit(*fmt) && width < sizeof(convbuf)-10) {
width = 10 * width + (*fmt - '0');
fmtnext();
}
}
if (width > sizeof(convbuf)) {
// Extract precision
if (*fmt == '.') {
fmt++;
bextractwp(prec);
}
// Make sure they're not too big
if (width > CONVBUFSIZE || prec > CONVBUFSIZE) {
rc = EINVAL;
goto leave;
break;
}
//----------------------------------------------------------------------------//
//
// Precision field
// Ignored until floats are implemented
// TODO before floats: %.XXXs
//
//----------------------------------------------------------------------------//
//
// Length field
//
while (1) {
if (*fmt == 'l' || *fmt == 'z') l++;
else if (*fmt == 'h') h++;
while (*fmt) {
if (*fmt == 'l' || *fmt == 'z' || *fmt == 't') {
fmt++;
l++;
}
else if (*fmt == 'h') {
fmt++;
h++;
}
// Next field
else break;
fmtnext();
}
// Consistency check
assert(!(l > 0 && h > 0));
assert(!(l > 2 || h > 2));
//----------------------------------------------------------------------------//
assert(!(l > 2 || h > 1));
//
// The type field
//
type = *fmt++;
// Characters
@ -259,7 +249,7 @@ loop:
uch = (uchar)va_arg(ap, int);
bputc(buf, uch);
goto loop;
continue;
}
// Strings
@ -268,12 +258,16 @@ loop:
if (s == NULL) s = "(null)";
for (; !rc && *s ; s++) {
// For strings, the precision field gives the maximum
// amount of characters to be read from the stream
// Zero/nonspecified precision means unlimited amount
if (prec == 0) prec = INT_MAX;
for (; *s && prec-- ; s++) {
rc = bputc(buf, (uchar)*s);
}
if (rc > 0) goto leave;
goto loop;
continue;
}
// Decimal, unsigned decimal, hexadecimal, octal and binary numbers
@ -284,7 +278,7 @@ loop:
else if (type == 'o') { base = 8; }
else if (type == 'b') { base = 2; }
// Pointers: %p = %#012x
// Pointers: %p = %#012lx
// (48-bit pointers have width 12 at least)
else if (type == 'p') {
type = 'x'; base = 16; zero++; hash++; l++;
@ -292,29 +286,33 @@ loop:
}
// Unknown/unsupported modifier
// Note: a '\0' after length field falls here
else {
rc = EINVAL;
goto leave;
break;
}
//----------------------------------------------------------------------------//
//
// Numerical conversions
//
// We re-use s to iterate convbuf
// We use s to iterate convbuf
s = convbuf;
// FIXME: this works, but is ugly as hell
#define bdoconvrt(pref, type, vtype) \
do { \
type i_##type = (type)va_arg(ap, vtype); \
pref##toa(i_##type, s, base); \
} while (0)
if (!l) {
if (sgn) {
if (h == 0) bdoconvrt(i, int, int);
if (h == 1) bdoconvrt(i, short, int);
if (h == 2) bdoconvrt(i, char, int);
} else {
if (h == 0) bdoconvrt(u, uint, uint);
if (h == 1) bdoconvrt(u, ushort, uint);
if (h == 2) bdoconvrt(u, uchar, uint);
}
}
@ -323,8 +321,6 @@ loop:
else bdoconvrt(ul, ulong, ulong);
}
//----------------------------------------------------------------------------//
//
// Implement flags and %X, and prints
//
@ -340,7 +336,10 @@ loop:
// Reset s
s = convbuf;
}
else len = strlen(s);
// Compute s's length
// It will always fit in an int
else len = (int)strlen(s);
// Adjust width
if (sgn && (plus || space)) width--;
@ -372,14 +371,12 @@ loop:
if (minus && !zero && width > len)
bdopadding(buf, width, base, ' ');
if (rc > 0) goto leave;
// Carry on to next modifier
}
// Continue parsing fmt
goto loop;
// Assert rc for debugging purposes
assert(!rc);
//----------------------------------------------------------------------------//
leave:
return rc;
}

0
kaleid/kernel/proc/sched.c → kaleid/kernel/ps/sched.c
View File