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-rw-r--r--libblkid/include/carefulputc.h67
1 files changed, 67 insertions, 0 deletions
diff --git a/libblkid/include/carefulputc.h b/libblkid/include/carefulputc.h
new file mode 100644
index 000000000..3a0ec5b66
--- /dev/null
+++ b/libblkid/include/carefulputc.h
@@ -0,0 +1,67 @@
+#ifndef UTIL_LINUX_CAREFUULPUTC_H
+#define UTIL_LINUX_CAREFUULPUTC_H
+
+/*
+ * A putc() for use in write and wall (that sometimes are sgid tty).
+ * It avoids control characters in our locale, and also ASCII control
+ * characters. Note that the locale of the recipient is unknown.
+*/
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+static inline int fputc_careful(int c, FILE *fp, const char fail)
+{
+ int ret;
+
+ if (isprint(c) || c == '\a' || c == '\t' || c == '\r' || c == '\n')
+ ret = putc(c, fp);
+ else if (!isascii(c))
+ ret = fprintf(fp, "\\%3o", (unsigned char)c);
+ else {
+ ret = putc(fail, fp);
+ if (ret != EOF)
+ ret = putc(c ^ 0x40, fp);
+ }
+ return (ret < 0) ? EOF : 0;
+}
+
+static inline void fputs_quoted(const char *data, FILE *out)
+{
+ const char *p;
+
+ fputc('"', out);
+ for (p = data; p && *p; p++) {
+ if ((unsigned char) *p == 0x22 || /* " */
+ (unsigned char) *p == 0x5c || /* \ */
+ (unsigned char) *p == 0x60 || /* ` */
+ (unsigned char) *p == 0x24 || /* $ */
+ !isprint((unsigned char) *p) ||
+ iscntrl((unsigned char) *p)) {
+
+ fprintf(out, "\\x%02x", (unsigned char) *p);
+ } else
+ fputc(*p, out);
+ }
+ fputc('"', out);
+}
+
+static inline void fputs_nonblank(const char *data, FILE *out)
+{
+ const char *p;
+
+ for (p = data; p && *p; p++) {
+ if (isblank((unsigned char) *p) ||
+ (unsigned char) *p == 0x5c || /* \ */
+ !isprint((unsigned char) *p) ||
+ iscntrl((unsigned char) *p)) {
+
+ fprintf(out, "\\x%02x", (unsigned char) *p);
+
+ } else
+ fputc(*p, out);
+ }
+}
+
+
+#endif /* _CAREFUULPUTC_H */