diff options
Diffstat (limited to '')
| -rw-r--r-- | qprintf.c | 72 |
1 files changed, 63 insertions, 9 deletions
@@ -31,7 +31,9 @@ * exported functions: * * int qprintf(char *str, size_t size, const char *format, ...) - * works like snprintf(), but format only knows about %d and %s + * works like snprintf(), but format only knows about %d, %x, %u and %s + * and for the numbers an optional length like %<len>d. If <len> beginns + * with '0' the free space is filled with '0's, otherwise with ' ' */ @@ -42,7 +44,7 @@ #include <stdarg.h> #include <string.h> -static char *itoa(char *buffer, const size_t size, int value) +static char *itoa(char *buffer, const size_t size, int value, unsigned int fixedlen, unsigned int fill0) { char *p; int sign; @@ -55,6 +57,8 @@ static char *itoa(char *buffer, const size_t size, int value) sign = 0; if (value < 0) { sign = 1; + if (fill0) + fixedlen -= 1; value = -value; } @@ -69,14 +73,26 @@ static char *itoa(char *buffer, const size_t size, int value) value = value / 10; } while (value != 0 && p > buffer); - if (sign && p > buffer) + if (sign && !fill0 && p > buffer) + *--p = '-'; + + /* fill fixed length */ + while (p > buffer && strlen(p) < fixedlen) { + if (fill0) { + *--p = '0'; + } else { + *--p = ' '; + } + } + + if (sign && fill0 && p > buffer) *--p = '-'; return p; } -static char *utoa(char *buffer, const size_t size, unsigned int value) +static char *utoa(char *buffer, const size_t size, unsigned int value, unsigned int fixedlen, unsigned int fill0) { char *p; @@ -95,11 +111,20 @@ static char *utoa(char *buffer, const size_t size, unsigned int value) value = value / 10; } while (value != 0 && p > buffer); + /* fill fixed length */ + while (p > buffer && strlen(p) < fixedlen) { + if (fill0) { + *--p = '0'; + } else { + *--p = ' '; + } + } + return p; } -static char *utox(char *buffer, const size_t size, unsigned int value) +static char *utox(char *buffer, const size_t size, unsigned int value, unsigned int fixedlen, unsigned int fill0) { char *p; int digit; @@ -120,10 +145,29 @@ static char *utox(char *buffer, const size_t size, unsigned int value) *--p = (digit < 10 ? '0' : 'a' - 10) + digit; } while (value != 0 && p > buffer); + /* fill fixed length */ + while (p > buffer && strlen(p) < fixedlen) { + if (fill0) { + *--p = '0'; + } else { + *--p = ' '; + } + } + return p; } +/*! + @function qprintf + @abstract quick print values into string + @discussion similar to snprintf(), but only support for "%s", "%d", "%u", "%x" with optional length for the numbers + like "%5d" (filled with ' ') or "%05x" (filled with '0') + @param str destination + @param size maximum length of destination string + @param format (like printf() with reduced number of formats) + @result length of produced string +*/ int qprintf(char *str, const size_t size, const char *format, ...) { @@ -145,7 +189,17 @@ int qprintf(char *str, const size_t size, const char *format, ...) char buf[12], *s; int d; unsigned int u; - switch (*++src) { + unsigned int fixedlen = 0; + unsigned int fill0 = 0; + + if (*++src == '0') + fill0 = 1; + while (*src >= '0' && *src <= '9') { + fixedlen = fixedlen * 10 + (*src - '0'); + src++; + } + + switch (*src) { case 's': src++; s = va_arg(ap, char *); @@ -157,7 +211,7 @@ int qprintf(char *str, const size_t size, const char *format, ...) case 'd': src++; d = va_arg(ap, int); - s = itoa(buf, sizeof(buf), d); + s = itoa(buf, sizeof(buf), d, fixedlen, fill0); while (len < size && *s != '\0') { len++; *dst++ = *s++; @@ -166,7 +220,7 @@ int qprintf(char *str, const size_t size, const char *format, ...) case 'u': src++; u = va_arg(ap, unsigned int); - s = utoa(buf, sizeof(buf), u); + s = utoa(buf, sizeof(buf), u, fixedlen, fill0); while (len < size - 1 && *s != '\0') { len++; *dst++ = *s++; @@ -175,7 +229,7 @@ int qprintf(char *str, const size_t size, const char *format, ...) case 'x': src++; u = va_arg(ap, unsigned int); - s = utox(buf, sizeof(buf), u); + s = utox(buf, sizeof(buf), u, fixedlen, fill0); while (len < size - 1 && *s != '\0') { len++; *dst++ = *s++; |