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-rw-r--r--src/shared/printf.c268
1 files changed, 0 insertions, 268 deletions
diff --git a/src/shared/printf.c b/src/shared/printf.c
deleted file mode 100644
index fffd801..0000000
--- a/src/shared/printf.c
+++ /dev/null
@@ -1,268 +0,0 @@
-#include <shared/mem.h>
-#include <shared/printf.h>
-#include <stdarg.h>
-#include <stdbool.h>
-#include <stdint.h>
-
-enum lenmod {
- LM_int,
- LM_long,
- LM_longlong,
- LM_size,
-};
-
-struct out_state {
- void (*back)(void *, const char *, size_t);
- void *backarg;
- int written;
-
- char *cache;
- size_t cpos, clen;
-};
-
-struct mods {
- char fill_char;
- size_t field_width;
- size_t precision;
-};
-
-
-static int flush(struct out_state *os) {
- if (os->cpos) {
- os->back(os->backarg, os->cache, os->cpos);
- os->written += os->cpos;
- os->cpos = 0;
- }
- return os->written;
-}
-
-static void output(struct out_state *os, const char *buf, size_t len) {
- if (os->cpos + len < os->clen) {
- memcpy(os->cache + os->cpos, buf, len);
- os->cpos += len;
- return;
- }
- flush(os);
- os->back(os->backarg, buf, len);
- os->written += len;
-}
-
-static void output_c(struct out_state *os, char c, int amt) {
- for (int i = 0; i < amt; i++)
- output(os, &c, 1);
-}
-
-
-static void pad(struct out_state *os, struct mods *m, size_t len) {
- output_c(os, m->fill_char, m->field_width - len);
-}
-
-static void padnum(struct out_state *os, struct mods *m, size_t len, char sign) {
- if (len < m->precision) {
- output_c(os, m->fill_char, m->field_width - m->precision - (sign ? 1 : 0));
- if (sign) output_c(os, sign, 1);
- output_c(os, '0', m->precision - len);
- } else {
- output_c(os, m->fill_char, m->field_width - len - (sign ? 1 : 0));
- if (sign) output_c(os, sign, 1);
- }
-}
-
-static void output_uint(struct out_state *os, struct mods *m, unsigned long long n, char sign) {
- char buf[sizeof(unsigned long long) * 3];
- size_t pos = sizeof(buf);
-
- if (!n) {
- buf[--pos] = '0';
- } else while (n) {
- unsigned long long q = n / 10, r = n % 10;
- buf[--pos] = r + '0';
- n = q;
- }
- size_t len = sizeof(buf) - pos;
- padnum(os, m, len, sign);
- output(os, buf + pos, len);
-}
-
-static void output_uint16(struct out_state *os, struct mods *m, unsigned long long n) {
- size_t len = 1;
- while (n >> (len * 4) && (len * 4) < (sizeof(n) * 8))
- len++;
- padnum(os, m, len, '\0');
- while (len-- > 0) {
- char h = '0' + ((n >> (len * 4)) & 0xf);
- if (h > '9') h += 'a' - '9' - 1;
- output_c(os, h, 1);
- }
-}
-
-
-int __printf_internal(const char *fmt, va_list argp,
- void (*back)(void*, const char*, size_t), void *backarg)
-{
- const char *seg = fmt; /* beginning of the current non-modifier streak */
- char cache[64];
- struct out_state os = {
- .back = back,
- .backarg = backarg,
- .cache = cache,
- .cpos = 0,
- .clen = sizeof(cache),
- };
-
- for (;;) {
- char c = *fmt++;
- if (c == '\0') {
- output(&os, seg, fmt - seg - 1);
- return flush(&os);
- }
- if (c != '%') continue;
- output(&os, seg, fmt - seg - 1);
-
- struct mods m = {
- .fill_char = ' ',
- .field_width = 0,
- .precision = 0,
- };
-
- for (bool modifier = true; modifier;) {
- c = *fmt++;
- switch (c) {
- case '0':
- m.fill_char = '0';
- break;
- default:
- modifier = false;
- break;
- }
- }
-
- while ('0' <= c && c <= '9') {
- m.field_width *= 10;
- m.field_width += c - '0';
- c = *fmt++;
- }
-
- if (c == '.') {
- c = *fmt++;
- if (c == '*') {
- // TODO handle negative precision
- m.precision = va_arg(argp, int);
- c = *fmt++;
- } else while ('0' <= c && c <= '9') {
- m.precision *= 10;
- m.precision += c - '0';
- c = *fmt++;
- }
- }
-
- enum lenmod lm;
- switch (c) {
- case 'l':
- lm = LM_long;
- c = *fmt++;
- if (c == 'l') {
- lm = LM_longlong;
- c = *fmt++;
- }
- break;
- case 'z':
- lm = LM_size;
- c = *fmt++;
- break;
- default:
- lm = LM_int;
- break;
- }
-
- switch (c) {
- unsigned long n, len;
- long ns;
- char sign;
-
- case 'c':
- output_c(&os, va_arg(argp, int), 1);
- break;
-
- case 's':
- const char *s = va_arg(argp, char*);
- if (s == NULL) s = "(null)";
- // TODO can segfault even if precision caps the string
- len = strlen(s);
- if (len > m.precision && m.precision != 0)
- len = m.precision;
- pad(&os, &m, len);
- output(&os, s, len);
- break;
-
- case 'p':
- output(&os, "0x", 2);
- output_uint16(&os, &m, (uintptr_t)va_arg(argp, void*));
- break;
-
- case 'x':
- if (lm == LM_int) n = va_arg(argp, unsigned int);
- else if (lm == LM_long) n = va_arg(argp, unsigned long);
- else if (lm == LM_longlong) n = va_arg(argp, unsigned long long);
- else if (lm == LM_size) n = va_arg(argp, size_t);
- output_uint16(&os, &m, n);
- break;
-
- case 'u':
- if (lm == LM_int) n = va_arg(argp, unsigned int);
- else if (lm == LM_long) n = va_arg(argp, unsigned long);
- else if (lm == LM_longlong) n = va_arg(argp, unsigned long long);
- else if (lm == LM_size) n = va_arg(argp, size_t);
- output_uint(&os, &m, n, '\0');
- break;
-
- case 'd':
- case 'i':
- if (lm == LM_int) ns = va_arg(argp, int);
- else if (lm == LM_long) ns = va_arg(argp, long);
- else if (lm == LM_longlong) ns = va_arg(argp, long long);
- else if (lm == LM_size) ns = va_arg(argp, size_t);
- sign = '\0';
- if (ns < 0) {
- ns = -ns;
- sign = '-';
- }
- output_uint(&os, &m, (long)ns, sign);
- break;
-
- case '%':
- output(&os, "%", 1);
- break;
- }
- seg = fmt;
- }
-}
-
-
-static void vsnprintf_backend(void *arg, const char *buf, size_t len) {
- char **ptrs = arg;
- size_t space = ptrs[1] - ptrs[0];
- if (!ptrs[0]) return;
- if (len > space) len = space;
-
- memcpy(ptrs[0], buf, len);
- ptrs[0] += len;
- /* ptrs[1] is the last byte of the buffer, it must be 0.
- * on overflow:
- * ptrs[0] + (ptrs[1] - ptrs[0]) = ptrs[1] */
- *ptrs[0] = '\0';
-}
-
-int vsnprintf(char *restrict str, size_t len, const char *restrict fmt, va_list ap) {
- char *ptrs[2] = {str, str + len - 1};
- return __printf_internal(fmt, ap, vsnprintf_backend, &ptrs);
-}
-
-int snprintf(char *restrict str, size_t len, const char *restrict fmt, ...) {
- int ret;
- va_list argp;
- va_start(argp, fmt);
- ret = vsnprintf(str, len, fmt, argp);
- va_end(argp);
- return ret;
-}
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