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-rw-r--r--src/stdlib/ecvt.c19
-rw-r--r--src/stdlib/fcvt.c25
-rw-r--r--src/stdlib/gcvt.c8
3 files changed, 52 insertions, 0 deletions
diff --git a/src/stdlib/ecvt.c b/src/stdlib/ecvt.c
new file mode 100644
index 00000000..48e70cd8
--- /dev/null
+++ b/src/stdlib/ecvt.c
@@ -0,0 +1,19 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+char *ecvt(double x, int n, int *dp, int *sign)
+{
+ static char buf[16];
+ char tmp[32];
+ int i, j;
+
+ if (n-1U > 15) n = 15;
+ sprintf(tmp, "%.*e", n-1, x);
+ i = *sign = (tmp[0]=='-');
+ for (j=0; tmp[i]!='e'; j+=(tmp[i++]!='.'))
+ buf[j] = tmp[i];
+ buf[j] = 0;
+ *dp = atoi(tmp+i+1);
+
+ return buf;
+}
diff --git a/src/stdlib/fcvt.c b/src/stdlib/fcvt.c
new file mode 100644
index 00000000..003aa5aa
--- /dev/null
+++ b/src/stdlib/fcvt.c
@@ -0,0 +1,25 @@
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+char *fcvt(double x, int n, int *dp, int *sign)
+{
+ char tmp[1500];
+ int i, lz;
+
+ if (n > 1400U) n = 1400;
+ sprintf(tmp, "%.*f", n, x);
+ i = (tmp[0] == '-');
+ if (tmp[i] == '0') lz = strspn(tmp+i+2, "0");
+ else lz = -(int)strcspn(tmp+i, ".");
+
+ if (n<=lz) {
+ *sign = i;
+ *dp = 0;
+ if (n>14U) n = 14;
+ return "000000000000000"+14-n;
+ }
+
+ return ecvt(x, n-lz, dp, sign);
+}
diff --git a/src/stdlib/gcvt.c b/src/stdlib/gcvt.c
new file mode 100644
index 00000000..6c075e25
--- /dev/null
+++ b/src/stdlib/gcvt.c
@@ -0,0 +1,8 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+char *gcvt(double x, int n, char *b)
+{
+ sprintf(b, "%.*g", n, x);
+ return b;
+}