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-rw-r--r--libc-top-half/musl/src/stdio/vfscanf.c351
1 files changed, 351 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/stdio/vfscanf.c b/libc-top-half/musl/src/stdio/vfscanf.c
new file mode 100644
index 0000000..b612bbd
--- /dev/null
+++ b/libc-top-half/musl/src/stdio/vfscanf.c
@@ -0,0 +1,351 @@
+#include <stdlib.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <wchar.h>
+#include <wctype.h>
+#include <limits.h>
+#include <string.h>
+#include <stdint.h>
+#ifdef __wasilibc_unmodified_upstream // Changes to optimize printf/scanf when long double isn't needed
+#else
+#include "printscan.h"
+#endif
+
+#include "stdio_impl.h"
+#include "shgetc.h"
+#include "intscan.h"
+#include "floatscan.h"
+
+#define SIZE_hh -2
+#define SIZE_h -1
+#define SIZE_def 0
+#define SIZE_l 1
+#define SIZE_L 2
+#define SIZE_ll 3
+
+static void store_int(void *dest, int size, unsigned long long i)
+{
+ if (!dest) return;
+ switch (size) {
+ case SIZE_hh:
+ *(char *)dest = i;
+ break;
+ case SIZE_h:
+ *(short *)dest = i;
+ break;
+ case SIZE_def:
+ *(int *)dest = i;
+ break;
+ case SIZE_l:
+ *(long *)dest = i;
+ break;
+ case SIZE_ll:
+ *(long long *)dest = i;
+ break;
+ }
+}
+
+static void *arg_n(va_list ap, unsigned int n)
+{
+ void *p;
+ unsigned int i;
+ va_list ap2;
+ va_copy(ap2, ap);
+ for (i=n; i>1; i--) va_arg(ap2, void *);
+ p = va_arg(ap2, void *);
+ va_end(ap2);
+ return p;
+}
+
+int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
+{
+ int width;
+ int size;
+ int alloc = 0;
+ int base;
+ const unsigned char *p;
+ int c, t;
+ char *s;
+ wchar_t *wcs;
+ mbstate_t st;
+ void *dest=NULL;
+ int invert;
+ int matches=0;
+ unsigned long long x;
+#if defined(__wasilibc_printscan_no_long_double)
+ long_double y;
+#else
+ long double y;
+#endif
+ off_t pos = 0;
+ unsigned char scanset[257];
+ size_t i, k;
+ wchar_t wc;
+
+ FLOCK(f);
+
+ if (!f->rpos) __toread(f);
+ if (!f->rpos) goto input_fail;
+
+ for (p=(const unsigned char *)fmt; *p; p++) {
+
+ alloc = 0;
+
+ if (isspace(*p)) {
+ while (isspace(p[1])) p++;
+ shlim(f, 0);
+ while (isspace(shgetc(f)));
+ shunget(f);
+ pos += shcnt(f);
+ continue;
+ }
+ if (*p != '%' || p[1] == '%') {
+ shlim(f, 0);
+ if (*p == '%') {
+ p++;
+ while (isspace((c=shgetc(f))));
+ } else {
+ c = shgetc(f);
+ }
+ if (c!=*p) {
+ shunget(f);
+ if (c<0) goto input_fail;
+ goto match_fail;
+ }
+ pos += shcnt(f);
+ continue;
+ }
+
+ p++;
+ if (*p=='*') {
+ dest = 0; p++;
+ } else if (isdigit(*p) && p[1]=='$') {
+ dest = arg_n(ap, *p-'0'); p+=2;
+ } else {
+ dest = va_arg(ap, void *);
+ }
+
+ for (width=0; isdigit(*p); p++) {
+ width = 10*width + *p - '0';
+ }
+
+ if (*p=='m') {
+ wcs = 0;
+ s = 0;
+ alloc = !!dest;
+ p++;
+ } else {
+ alloc = 0;
+ }
+
+ size = SIZE_def;
+ switch (*p++) {
+ case 'h':
+ if (*p == 'h') p++, size = SIZE_hh;
+ else size = SIZE_h;
+ break;
+ case 'l':
+ if (*p == 'l') p++, size = SIZE_ll;
+ else size = SIZE_l;
+ break;
+ case 'j':
+ size = SIZE_ll;
+ break;
+ case 'z':
+ case 't':
+ size = SIZE_l;
+ break;
+ case 'L':
+ size = SIZE_L;
+ break;
+ case 'd': case 'i': case 'o': case 'u': case 'x':
+ case 'a': case 'e': case 'f': case 'g':
+ case 'A': case 'E': case 'F': case 'G': case 'X':
+ case 's': case 'c': case '[':
+ case 'S': case 'C':
+ case 'p': case 'n':
+ p--;
+ break;
+ default:
+ goto fmt_fail;
+ }
+
+ t = *p;
+
+ /* C or S */
+ if ((t&0x2f) == 3) {
+ t |= 32;
+ size = SIZE_l;
+ }
+
+ switch (t) {
+ case 'c':
+ if (width < 1) width = 1;
+ case '[':
+ break;
+ case 'n':
+ store_int(dest, size, pos);
+ /* do not increment match count, etc! */
+ continue;
+ default:
+ shlim(f, 0);
+ while (isspace(shgetc(f)));
+ shunget(f);
+ pos += shcnt(f);
+ }
+
+ shlim(f, width);
+ if (shgetc(f) < 0) goto input_fail;
+ shunget(f);
+
+ switch (t) {
+ case 's':
+ case 'c':
+ case '[':
+ if (t == 'c' || t == 's') {
+ memset(scanset, -1, sizeof scanset);
+ scanset[0] = 0;
+ if (t == 's') {
+ scanset[1+'\t'] = 0;
+ scanset[1+'\n'] = 0;
+ scanset[1+'\v'] = 0;
+ scanset[1+'\f'] = 0;
+ scanset[1+'\r'] = 0;
+ scanset[1+' '] = 0;
+ }
+ } else {
+ if (*++p == '^') p++, invert = 1;
+ else invert = 0;
+ memset(scanset, invert, sizeof scanset);
+ scanset[0] = 0;
+ if (*p == '-') p++, scanset[1+'-'] = 1-invert;
+ else if (*p == ']') p++, scanset[1+']'] = 1-invert;
+ for (; *p != ']'; p++) {
+ if (!*p) goto fmt_fail;
+ if (*p=='-' && p[1] && p[1] != ']')
+ for (c=p++[-1]; c<*p; c++)
+ scanset[1+c] = 1-invert;
+ scanset[1+*p] = 1-invert;
+ }
+ }
+ wcs = 0;
+ s = 0;
+ i = 0;
+ k = t=='c' ? width+1U : 31;
+ if (size == SIZE_l) {
+ if (alloc) {
+ wcs = malloc(k*sizeof(wchar_t));
+ if (!wcs) goto alloc_fail;
+ } else {
+ wcs = dest;
+ }
+ st = (mbstate_t){0};
+ while (scanset[(c=shgetc(f))+1]) {
+ switch (mbrtowc(&wc, &(char){c}, 1, &st)) {
+ case -1:
+ goto input_fail;
+ case -2:
+ continue;
+ }
+ if (wcs) wcs[i++] = wc;
+ if (alloc && i==k) {
+ k+=k+1;
+ wchar_t *tmp = realloc(wcs, k*sizeof(wchar_t));
+ if (!tmp) goto alloc_fail;
+ wcs = tmp;
+ }
+ }
+ if (!mbsinit(&st)) goto input_fail;
+ } else if (alloc) {
+ s = malloc(k);
+ if (!s) goto alloc_fail;
+ while (scanset[(c=shgetc(f))+1]) {
+ s[i++] = c;
+ if (i==k) {
+ k+=k+1;
+ char *tmp = realloc(s, k);
+ if (!tmp) goto alloc_fail;
+ s = tmp;
+ }
+ }
+ } else if ((s = dest)) {
+ while (scanset[(c=shgetc(f))+1])
+ s[i++] = c;
+ } else {
+ while (scanset[(c=shgetc(f))+1]);
+ }
+ shunget(f);
+ if (!shcnt(f)) goto match_fail;
+ if (t == 'c' && shcnt(f) != width) goto match_fail;
+ if (alloc) {
+ if (size == SIZE_l) *(wchar_t **)dest = wcs;
+ else *(char **)dest = s;
+ }
+ if (t != 'c') {
+ if (wcs) wcs[i] = 0;
+ if (s) s[i] = 0;
+ }
+ break;
+ case 'p':
+ case 'X':
+ case 'x':
+ base = 16;
+ goto int_common;
+ case 'o':
+ base = 8;
+ goto int_common;
+ case 'd':
+ case 'u':
+ base = 10;
+ goto int_common;
+ case 'i':
+ base = 0;
+ int_common:
+ x = __intscan(f, base, 0, ULLONG_MAX);
+ if (!shcnt(f)) goto match_fail;
+ if (t=='p' && dest) *(void **)dest = (void *)(uintptr_t)x;
+ else store_int(dest, size, x);
+ break;
+ case 'a': case 'A':
+ case 'e': case 'E':
+ case 'f': case 'F':
+ case 'g': case 'G':
+ y = __floatscan(f, size, 0);
+ if (!shcnt(f)) goto match_fail;
+ if (dest) switch (size) {
+ case SIZE_def:
+ *(float *)dest = y;
+ break;
+ case SIZE_l:
+ *(double *)dest = y;
+ break;
+ case SIZE_L:
+#if defined(__wasilibc_printscan_no_long_double)
+ long_double_not_supported();
+#else
+ *(long double *)dest = y;
+#endif
+ break;
+ }
+ break;
+ }
+
+ pos += shcnt(f);
+ if (dest) matches++;
+ }
+ if (0) {
+fmt_fail:
+alloc_fail:
+input_fail:
+ if (!matches) matches--;
+match_fail:
+ if (alloc) {
+ free(s);
+ free(wcs);
+ }
+ }
+ FUNLOCK(f);
+ return matches;
+}
+
+weak_alias(vfscanf,__isoc99_vfscanf);
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-08 01:03:03 +0000