bigbiff | 7b4c7a6 | 2015-01-01 19:44:14 -0500 | [diff] [blame^] | 1 | #ifndef UTIL_LINUX_CAREFUULPUTC_H |
| 2 | #define UTIL_LINUX_CAREFUULPUTC_H |
| 3 | |
| 4 | /* |
| 5 | * A putc() for use in write and wall (that sometimes are sgid tty). |
| 6 | * It avoids control characters in our locale, and also ASCII control |
| 7 | * characters. Note that the locale of the recipient is unknown. |
| 8 | */ |
| 9 | #include <stdio.h> |
| 10 | #include <string.h> |
| 11 | #include <ctype.h> |
| 12 | |
| 13 | static inline int fputc_careful(int c, FILE *fp, const char fail) |
| 14 | { |
| 15 | int ret; |
| 16 | |
| 17 | if (isprint(c) || c == '\a' || c == '\t' || c == '\r' || c == '\n') |
| 18 | ret = putc(c, fp); |
| 19 | else if (!isascii(c)) |
| 20 | ret = fprintf(fp, "\\%3o", (unsigned char)c); |
| 21 | else { |
| 22 | ret = putc(fail, fp); |
| 23 | if (ret != EOF) |
| 24 | ret = putc(c ^ 0x40, fp); |
| 25 | } |
| 26 | return (ret < 0) ? EOF : 0; |
| 27 | } |
| 28 | |
| 29 | static inline void fputs_quoted(const char *data, FILE *out) |
| 30 | { |
| 31 | const char *p; |
| 32 | |
| 33 | fputc('"', out); |
| 34 | for (p = data; p && *p; p++) { |
| 35 | if ((unsigned char) *p == 0x22 || /* " */ |
| 36 | (unsigned char) *p == 0x5c || /* \ */ |
| 37 | (unsigned char) *p == 0x60 || /* ` */ |
| 38 | (unsigned char) *p == 0x24 || /* $ */ |
| 39 | !isprint((unsigned char) *p) || |
| 40 | iscntrl((unsigned char) *p)) { |
| 41 | |
| 42 | fprintf(out, "\\x%02x", (unsigned char) *p); |
| 43 | } else |
| 44 | fputc(*p, out); |
| 45 | } |
| 46 | fputc('"', out); |
| 47 | } |
| 48 | |
| 49 | static inline void fputs_nonblank(const char *data, FILE *out) |
| 50 | { |
| 51 | const char *p; |
| 52 | |
| 53 | for (p = data; p && *p; p++) { |
| 54 | if (isblank((unsigned char) *p) || |
| 55 | (unsigned char) *p == 0x5c || /* \ */ |
| 56 | !isprint((unsigned char) *p) || |
| 57 | iscntrl((unsigned char) *p)) { |
| 58 | |
| 59 | fprintf(out, "\\x%02x", (unsigned char) *p); |
| 60 | |
| 61 | } else |
| 62 | fputc(*p, out); |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | |
| 67 | #endif /* _CAREFUULPUTC_H */ |