summaryrefslogtreecommitdiffstats
path: root/include/carefulputc.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:30:35 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:30:35 +0000
commit378c18e5f024ac5a8aef4cb40d7c9aa9633d144c (patch)
tree44dfb6ca500d32cabd450649b322a42e70a30683 /include/carefulputc.h
parentInitial commit. (diff)
downloadutil-linux-378c18e5f024ac5a8aef4cb40d7c9aa9633d144c.tar.xz
util-linux-378c18e5f024ac5a8aef4cb40d7c9aa9633d144c.zip
Adding upstream version 2.38.1.upstream/2.38.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/carefulputc.h')
-rw-r--r--include/carefulputc.h74
1 files changed, 74 insertions, 0 deletions
diff --git a/include/carefulputc.h b/include/carefulputc.h
new file mode 100644
index 0000000..8860b12
--- /dev/null
+++ b/include/carefulputc.h
@@ -0,0 +1,74 @@
+#ifndef UTIL_LINUX_CAREFULPUTC_H
+#define UTIL_LINUX_CAREFULPUTC_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>
+
+#include "cctype.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 (!c_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_case(const char *data, FILE *out, int dir)
+{
+ 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(dir == 1 ? toupper(*p) :
+ dir == -1 ? tolower(*p) :
+ *p, out);
+ }
+ fputc('"', out);
+}
+
+#define fputs_quoted(_d, _o) fputs_quoted_case(_d, _o, 0)
+#define fputs_quoted_upper(_d, _o) fputs_quoted_case(_d, _o, 1)
+#define fputs_quoted_lower(_d, _o) fputs_quoted_case(_d, _o, -1)
+
+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 /* _CAREFULPUTC_H */