diff options
Diffstat (limited to 'src/lib/libast/comp/wordexp.c')
| -rw-r--r-- | src/lib/libast/comp/wordexp.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/src/lib/libast/comp/wordexp.c b/src/lib/libast/comp/wordexp.c new file mode 100644 index 0000000..33016dc --- /dev/null +++ b/src/lib/libast/comp/wordexp.c @@ -0,0 +1,217 @@ +/*********************************************************************** +* * +* 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 +/* + * POSIX 1003.2 wordexp implementation + */ + +#include <ast.h> +#include <wordexp.h> +#include <stak.h> + +struct list +{ + struct list *next; +}; + +/* + * elimnates shell quoting as inserted with sh_fmtq + * result relaces <string> + * length of resulting string is returned. + */ +static int sh_unquote(char* string) +{ + register char *sp=string, *dp; + register int c; + while((c= *sp) && c!='\'') + sp++; + if(c==0) + return(sp-string); + if((dp=sp) > string && sp[-1]=='$') + { + register int n=stresc(sp+1); + /* copy all but trailing ' */ + while(--n>0) + *dp++ = *++sp; + } + else + { + while((c= *++sp) && c!='\'') + *dp++ = c; + } + *dp=0; + return(dp-string); +} + +int wordexp(const char *string, wordexp_t *wdarg, register int flags) +{ + register Sfio_t *iop; + register char *cp=(char*)string; + register int c,quoted=0,literal=0,ac=0; + int offset; + char *savebase,**av; + if(offset=staktell()) + savebase = stakfreeze(0); + if(flags&WRDE_REUSE) + wordfree(wdarg); + else if(!(flags&WRDE_APPEND)) + { + wdarg->we_wordv = 0; + wdarg->we_wordc = 0; + } + if(flags&WRDE_UNDEF) + stakwrite("set -u\n",7); + if(!(flags&WRDE_SHOWERR)) + stakwrite("exec 2> /dev/null\n",18); + stakwrite("print -f \"%q\\n\" ",16); + if(*cp=='#') + stakputc('\\'); + while(c = *cp++) + { + if(c=='\'' && !quoted) + literal = !literal; + else if(!literal) + { + if(c=='\\' && (!quoted || strchr("\\\"`\n$",c))) + { + stakputc('\\'); + if(c= *cp) + cp++; + else + c = '\\'; + } + else if(c=='"') + quoted = !quoted; + else if(c=='`' || (c=='$' && *cp=='(')) + { + if(flags&WRDE_NOCMD) + { + c=WRDE_CMDSUB; + goto err; + } + /* only the shell can parse the rest */ + stakputs(cp-1); + break; + } + else if(!quoted && strchr("|&\n;<>"+ac,c)) + { + c=WRDE_BADCHAR; + goto err; + } + else if(c=='(') /* allow | and & inside pattern */ + ac=2; + } + stakputc(c); + } + stakputc(0); + if(!(iop = sfpopen((Sfio_t*)0,stakptr(0),"r"))) + { + c = WRDE_NOSHELL; + goto err; + } + stakseek(0); + ac = 0; + while((c=sfgetc(iop)) != EOF) + { + if(c=='\'') + quoted = ! quoted; + else if(!quoted && (c==' ' || c=='\n')) + { + ac++; + c = 0; + } + stakputc(c); + } + if(c=sfclose(iop)) + { + if(c==3 || !(flags&WRDE_UNDEF)) + c=WRDE_SYNTAX; + else + c=WRDE_BADVAL; + goto err; + } + c = ac+2; + if(flags&WRDE_DOOFFS) + c += wdarg->we_offs; + if(flags&WRDE_APPEND) + av = (char**)realloc((void*)&wdarg->we_wordv[-1], (wdarg->we_wordc+c)*sizeof(char*)); + else if(av = (char**)malloc(c*sizeof(char*))) + { + if(flags&WRDE_DOOFFS) + memset((void*)av,0,(wdarg->we_offs+1)*sizeof(char*)); + else + av[0] = 0; + } + if(!av) + return(WRDE_NOSPACE); + c = staktell(); + if(!(cp = (char*)malloc(sizeof(char*)+c))) + { + c=WRDE_NOSPACE; + goto err; + } + ((struct list*)cp)->next = (struct list*)(*av); + *av++ = (char*)cp; + cp += sizeof(char*); + wdarg->we_wordv = av; + if(flags&WRDE_APPEND) + av += wdarg->we_wordc; + wdarg->we_wordc += ac; + if(flags&WRDE_DOOFFS) + av += wdarg->we_offs; + memcpy((void*)cp,stakptr(offset),c); + while(ac-- > 0) + { + *av++ = cp; + sh_unquote(cp); + while(c= *cp++); + } + *av = 0; + c=0; +err: + if(offset) + stakset(savebase,offset); + else + stakseek(0); + return(c); +} + +/* + * free fields in <wdarg> + */ +int wordfree(register wordexp_t *wdarg) +{ + struct list *arg, *argnext; + if(wdarg->we_wordv) + { + argnext = (struct list*)wdarg->we_wordv[-1]; + while(arg=argnext) + { + argnext = arg->next; + free((void*)arg); + } + free((void*)&wdarg->we_wordv[-1]); + wdarg->we_wordv = 0; + } + wdarg->we_wordc=0; + return(0); +} |