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Diffstat (limited to 'src/lib/libast/string/fmtesc.c')
| -rw-r--r-- | src/lib/libast/string/fmtesc.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/src/lib/libast/string/fmtesc.c b/src/lib/libast/string/fmtesc.c new file mode 100644 index 0000000..753b195 --- /dev/null +++ b/src/lib/libast/string/fmtesc.c @@ -0,0 +1,248 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2011 AT&T Intellectual Property * +* and is licensed under the * +* Eclipse Public License, Version 1.0 * +* by AT&T Intellectual Property * +* * +* A copy of the License is available at * +* http://www.eclipse.org/org/documents/epl-v10.html * +* (with md5 checksum b35adb5213ca9657e911e9befb180842) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped +/* + * Glenn Fowler + * AT&T Research + * + * return string with expanded escape chars + */ + +#include <ast.h> +#include <ccode.h> +#include <ctype.h> +#if _hdr_wchar && _hdr_wctype +#include <wchar.h> +#include <wctype.h> +#endif + +/* + * quote string as of length n with qb...qe + * (flags&FMT_ALWAYS) always quotes, otherwise quote output only if necessary + * qe and the usual suspects are \... escaped + * (flags&FMT_WIDE) doesn't escape 8 bit chars + * (flags&FMT_ESCAPED) doesn't \... escape the usual suspects + * (flags&FMT_SHELL) escape $`"#;~&|()<>[]*? + */ + +char* +fmtquote(const char* as, const char* qb, const char* qe, size_t n, int flags) +{ + register unsigned char* s = (unsigned char*)as; + register unsigned char* e = s + n; + register char* b; + register int c; + register int m; + register int escaped; + register int spaced; + register int doublequote; + register int singlequote; + int shell; + char* f; + char* buf; + + c = 4 * (n + 1); + if (qb) + c += strlen((char*)qb); + if (qe) + c += strlen((char*)qe); + b = buf = fmtbuf(c); + shell = 0; + doublequote = 0; + singlequote = 0; + if (qb) + { + if (qb[0] == '$' && qb[1] == '\'' && qb[2] == 0) + shell = 1; + else if ((flags & FMT_SHELL) && qb[1] == 0) + { + if (qb[0] == '"') + doublequote = 1; + else if (qb[0] == '\'') + singlequote = 1; + } + while (*b = *qb++) + b++; + } + else if (flags & FMT_SHELL) + doublequote = 1; + f = b; + escaped = spaced = !!(flags & FMT_ALWAYS); + while (s < e) + { + if ((m = mbsize(s)) > 1 && (s + m) <= e) + { +#if _hdr_wchar && _hdr_wctype + c = mbchar(s); + if (!spaced && !escaped && (iswspace(c) || iswcntrl(c))) + spaced = 1; + s -= m; +#endif + while (m--) + *b++ = *s++; + } + else + { + c = *s++; + if (!(flags & FMT_ESCAPED) && (iscntrl(c) || !isprint(c) || c == '\\')) + { + escaped = 1; + *b++ = '\\'; + switch (c) + { + case CC_bel: + c = 'a'; + break; + case '\b': + c = 'b'; + break; + case '\f': + c = 'f'; + break; + case '\n': + c = 'n'; + break; + case '\r': + c = 'r'; + break; + case '\t': + c = 't'; + break; + case CC_vt: + c = 'v'; + break; + case CC_esc: + c = 'E'; + break; + case '\\': + break; + default: + if (!(flags & FMT_WIDE) || !(c & 0200)) + { + *b++ = '0' + ((c >> 6) & 07); + *b++ = '0' + ((c >> 3) & 07); + c = '0' + (c & 07); + } + else + b--; + break; + } + } + else if (c == '\\') + { + escaped = 1; + *b++ = c; + if (*s) + c = *s++; + } + else if (qe && strchr(qe, c)) + { + if (singlequote && c == '\'') + { + spaced = 1; + *b++ = '\''; + *b++ = '\\'; + *b++ = '\''; + c = '\''; + } + else + { + escaped = 1; + *b++ = '\\'; + } + } + else if (c == '$' || c == '`') + { + if (c == '$' && (flags & FMT_PARAM) && (*s == '{' || *s == '(')) + { + if (singlequote || shell) + { + escaped = 1; + *b++ = '\''; + *b++ = c; + *b++ = *s++; + if (shell) + { + spaced = 1; + *b++ = '$'; + } + c = '\''; + } + else + { + escaped = 1; + *b++ = c; + c = *s++; + } + } + else if (doublequote) + *b++ = '\\'; + else if (singlequote || (flags & FMT_SHELL)) + spaced = 1; + } + else if (!spaced && !escaped && (isspace(c) || ((flags & FMT_SHELL) || shell) && (strchr("\";~&|()<>[]*?", c) || c == '#' && (b == f || isspace(*(b - 1)))))) + spaced = 1; + *b++ = c; + } + } + if (qb) + { + if (!escaped) + buf += shell + !spaced; + if (qe && (escaped || spaced)) + while (*b = *qe++) + b++; + } + *b = 0; + return buf; +} + +/* + * escape the usual suspects and quote chars in qs + * in length n string as + */ + +char* +fmtnesq(const char* as, const char* qs, size_t n) +{ + return fmtquote(as, NiL, qs, n, 0); +} + +/* + * escape the usual suspects and quote chars in qs + */ + +char* +fmtesq(const char* as, const char* qs) +{ + return fmtquote(as, NiL, qs, strlen((char*)as), 0); +} + +/* + * escape the usual suspects + */ + +char* +fmtesc(const char* as) +{ + return fmtquote(as, NiL, NiL, strlen((char*)as), 0); +} |