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Diffstat (limited to 'bin/dash/src/bltin/printf.c')
| -rw-r--r-- | bin/dash/src/bltin/printf.c | 478 |
1 files changed, 478 insertions, 0 deletions
diff --git a/bin/dash/src/bltin/printf.c b/bin/dash/src/bltin/printf.c new file mode 100644 index 00000000..7785735b --- /dev/null +++ b/bin/dash/src/bltin/printf.c @@ -0,0 +1,478 @@ +/* + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1997-2005 + * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/types.h> + +#include <ctype.h> +#include <errno.h> +#include <inttypes.h> +#include <limits.h> +#include <stdarg.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +static int conv_escape_str(char *, char **); +static char *conv_escape(char *, int *); +static int getchr(void); +static double getdouble(void); +static uintmax_t getuintmax(int); +static char *getstr(void); +static char *mklong(const char *, const char *); +static void check_conversion(const char *, const char *); + +static int rval; +static char **gargv; + +#define isodigit(c) ((c) >= '0' && (c) <= '7') +#define octtobin(c) ((c) - '0') + +#include "bltin.h" +#include "system.h" + +#define PF(f, func) { \ + switch ((char *)param - (char *)array) { \ + default: \ + (void)printf(f, array[0], array[1], func); \ + break; \ + case sizeof(*param): \ + (void)printf(f, array[0], func); \ + break; \ + case 0: \ + (void)printf(f, func); \ + break; \ + } \ +} + +#define ASPF(sp, f, func) ({ \ + int ret; \ + switch ((char *)param - (char *)array) { \ + default: \ + ret = xasprintf(sp, f, array[0], array[1], func); \ + break; \ + case sizeof(*param): \ + ret = xasprintf(sp, f, array[0], func); \ + break; \ + case 0: \ + ret = xasprintf(sp, f, func); \ + break; \ + } \ + ret; \ +}) + + +static int print_escape_str(const char *f, int *param, int *array, char *s) +{ + struct stackmark smark; + char *p, *q; + int done; + int len; + int total; + + setstackmark(&smark); + done = conv_escape_str(s, &q); + p = stackblock(); + len = q - p; + total = len - 1; + + q[-1] = (!!((f[1] - 's') | done) - 1) & f[2]; + total += !!q[-1]; + if (f[1] == 's') + goto easy; + + p = makestrspace(len, q); + memset(p, 'X', total); + p[total] = 0; + + q = stackblock(); + total = ASPF(&p, f, p); + + len = strchrnul(p, 'X') - p; + memcpy(p + len, q, strspn(p + len, "X")); + +easy: + out1mem(p, total); + + popstackmark(&smark); + return done; +} + + +int printfcmd(int argc, char *argv[]) +{ + char *fmt; + char *format; + int ch; + + rval = 0; + + nextopt(nullstr); + + argv = argptr; + format = *argv; + + if (!format) + error("usage: printf format [arg ...]"); + + gargv = ++argv; + +#define SKIP1 "#-+ 0" +#define SKIP2 "*0123456789" + do { + /* + * Basic algorithm is to scan the format string for conversion + * specifications -- once one is found, find out if the field + * width or precision is a '*'; if it is, gather up value. + * Note, format strings are reused as necessary to use up the + * provided arguments, arguments of zero/null string are + * provided to use up the format string. + */ + + /* find next format specification */ + for (fmt = format; (ch = *fmt++) ;) { + char *start; + char nextch; + int array[2]; + int *param; + + if (ch == '\\') { + int c_ch; + fmt = conv_escape(fmt, &c_ch); + ch = c_ch; + goto pc; + } + if (ch != '%' || (*fmt == '%' && (++fmt || 1))) { +pc: + putchar(ch); + continue; + } + + /* Ok - we've found a format specification, + Save its address for a later printf(). */ + start = fmt - 1; + param = array; + + /* skip to field width */ + fmt += strspn(fmt, SKIP1); + if (*fmt == '*') { + ++fmt; + *param++ = getuintmax(1); + } else { + /* skip to possible '.', + * get following precision + */ + fmt += strspn(fmt, SKIP2); + } + + if (*fmt == '.') { + ++fmt; + if (*fmt == '*') { + ++fmt; + *param++ = getuintmax(1); + } else + fmt += strspn(fmt, SKIP2); + } + + ch = *fmt; + if (!ch) + error("missing format character"); + /* null terminate format string to we can use it + as an argument to printf. */ + nextch = fmt[1]; + fmt[1] = 0; + switch (ch) { + + case 'b': + *fmt = 's'; + /* escape if a \c was encountered */ + if (print_escape_str(start, param, array, + getstr())) + goto out; + *fmt = 'b'; + break; + case 'c': { + int p = getchr(); + PF(start, p); + break; + } + case 's': { + char *p = getstr(); + PF(start, p); + break; + } + case 'd': + case 'i': { + uintmax_t p = getuintmax(1); + start = mklong(start, fmt); + PF(start, p); + break; + } + case 'o': + case 'u': + case 'x': + case 'X': { + uintmax_t p = getuintmax(0); + start = mklong(start, fmt); + PF(start, p); + break; + } + case 'a': + case 'A': + case 'e': + case 'E': + case 'f': + case 'F': + case 'g': + case 'G': { + double p = getdouble(); + PF(start, p); + break; + } + default: + error("%s: invalid directive", start); + } + *++fmt = nextch; + } + } while (gargv != argv && *gargv); + +out: + return rval; +} + + +/* + * Print SysV echo(1) style escape string + * Halts processing string if a \c escape is encountered. + */ +static int +conv_escape_str(char *str, char **sp) +{ + int c; + int ch; + char *cp; + + /* convert string into a temporary buffer... */ + STARTSTACKSTR(cp); + + do { + c = ch = *str++; + if (ch != '\\') + continue; + + c = *str++; + if (c == 'c') { + /* \c as in SYSV echo - abort all processing.... */ + c = ch = 0x100; + continue; + } + + /* + * %b string octal constants are not like those in C. + * They start with a \0, and are followed by 0, 1, 2, + * or 3 octal digits. + */ + if (c == '0' && isodigit(*str)) + str++; + + /* Finally test for sequences valid in the format string */ + str = conv_escape(str - 1, &c); + } while (STPUTC(c, cp), (char)ch); + + *sp = cp; + + return ch; +} + +/* + * Print "standard" escape characters + */ +static char * +conv_escape(char *str, int *conv_ch) +{ + int value; + int ch; + + ch = *str; + + switch (ch) { + default: + if (!isodigit(*str)) { + value = '\\'; + goto out; + } + + ch = 3; + value = 0; + do { + value <<= 3; + value += octtobin(*str++); + } while (isodigit(*str) && --ch); + goto out; + + case '\\': value = '\\'; break; /* backslash */ + case 'a': value = '\a'; break; /* alert */ + case 'b': value = '\b'; break; /* backspace */ + case 'f': value = '\f'; break; /* form-feed */ + case 'n': value = '\n'; break; /* newline */ + case 'r': value = '\r'; break; /* carriage-return */ + case 't': value = '\t'; break; /* tab */ + case 'v': value = '\v'; break; /* vertical-tab */ + } + + str++; +out: + *conv_ch = value; + return str; +} + +static char * +mklong(const char *str, const char *ch) +{ + /* + * Replace a string like "%92.3u" with "%92.3"PRIuMAX. + * + * Although C99 does not guarantee it, we assume PRIiMAX, + * PRIoMAX, PRIuMAX, PRIxMAX, and PRIXMAX are all the same + * as PRIdMAX with the final 'd' replaced by the corresponding + * character. + */ + + char *copy; + size_t len; + + len = ch - str + sizeof(PRIdMAX); + STARTSTACKSTR(copy); + copy = makestrspace(len, copy); + memcpy(copy, str, len - sizeof(PRIdMAX)); + memcpy(copy + len - sizeof(PRIdMAX), PRIdMAX, sizeof(PRIdMAX)); + copy[len - 2] = *ch; + return (copy); +} + +static int +getchr(void) +{ + int val = 0; + + if (*gargv) + val = **gargv++; + return val; +} + +static char * +getstr(void) +{ + char *val = nullstr; + + if (*gargv) + val = *gargv++; + return val; +} + +static uintmax_t +getuintmax(int sign) +{ + uintmax_t val = 0; + char *cp, *ep; + + cp = *gargv; + if (cp == NULL) + goto out; + gargv++; + + val = (unsigned char) cp[1]; + if (*cp == '\"' || *cp == '\'') + goto out; + + errno = 0; + val = sign ? strtoimax(cp, &ep, 0) : strtoumax(cp, &ep, 0); + check_conversion(cp, ep); +out: + return val; +} + +static double +getdouble(void) +{ + double val; + char *cp, *ep; + + cp = *gargv; + if (cp == NULL) + return 0; + gargv++; + + if (*cp == '\"' || *cp == '\'') + return (unsigned char) cp[1]; + + errno = 0; + val = strtod(cp, &ep); + check_conversion(cp, ep); + return val; +} + +static void +check_conversion(const char *s, const char *ep) +{ + if (*ep) { + if (ep == s) + warnx("%s: expected numeric value", s); + else + warnx("%s: not completely converted", s); + rval = 1; + } else if (errno == ERANGE) { + warnx("%s: %s", s, strerror(ERANGE)); + rval = 1; + } +} + +int +echocmd(int argc, char **argv) +{ + const char *lastfmt = snlfmt; + int nonl; + + if (*++argv && equal(*argv, "-n")) { + argv++; + lastfmt = "%s"; + } + + do { + const char *fmt = "%s "; + char *s = *argv; + + if (!s || !*++argv) + fmt = lastfmt; + + nonl = print_escape_str(fmt, NULL, NULL, s ?: nullstr); + } while (!nonl && *argv); + return 0; +} |