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Diffstat (limited to 'funtools/util/macro.c')
| -rw-r--r-- | funtools/util/macro.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/funtools/util/macro.c b/funtools/util/macro.c new file mode 100644 index 0000000..a96b3cc --- /dev/null +++ b/funtools/util/macro.c @@ -0,0 +1,216 @@ +/* + * Copyright (c) 1999-2003 Smithsonian Astrophysical Observatory + */ + +/* + * + * macro.c -- macro expansion routines + * + */ + +#include <macro.h> + +/* SAOMOD_CTYPE -- work around Slackware/RedHat incompatibility */ +#ifdef linux +#ifdef isalnum +#undef isalnum +#define isalnum(c) (isalpha(c)||isdigit(c)) +#endif +#endif + +#define BUFINC 5000 + +/* + * + * Private Routines + * + * + */ + +/* + * + * AddString -- add a string to a buffer + * + */ +#ifdef ANSI_FUNC +static void +AddString(char **buf, int *blen, int *maxlen, char *str) +#else +static void AddString(buf, blen, maxlen, str) + char **buf; + int *blen; + int *maxlen; + char *str; +#endif +{ + int slen; + + if( !str || !*str ) return; + slen = strlen(str) + 1; + while( (*blen + slen) >= *maxlen ){ + *maxlen += BUFINC; + *buf = (char *)realloc(*buf, *maxlen); + } + strcat(*buf, str); + *blen += slen; +} + +/* + * + * AddChar -- add a single char to a buffer + * + */ +#ifdef ANSI_FUNC +static void +AddChar(char **buf, int *blen, int *maxlen, int c) +#else +static void AddChar(buf, blen, maxlen, c) + char **buf; + int *blen; + int *maxlen; + int c; +#endif +{ + char tbuf[2]; + + tbuf[0] = (char)c; + tbuf[1] = '\0'; + AddString(buf, blen, maxlen, tbuf); +} + +/* + * + * LookupKeywords -- lookup a name in a list fo keywords and + * return the associated value. + * (Should use quarks ...) + * + */ +#ifdef ANSI_FUNC +static char * +LookupKeywords(char *name, char **keyword, char **value, int nkey) +#else +static char *LookupKeywords(name, keyword, value, nkey) + char *name; + char **keyword; + char **value; + int nkey; +#endif +{ + int i; + for(i=0; i<nkey; i++){ + if( keyword[i] && !strcmp(name, keyword[i]) ) + return(value[i]); + } + return(NULL); +} + +/* + * + * Public Routines + * + * + */ + +/* + * + * ExpandMacro -- expand a macro using a client's callback + * returns: expanded macro as an allocated string + * + */ +#ifdef ANSI_FUNC +char * +ExpandMacro(char *icmd, char **keyword, char **value, int nkey, + MacroCall client_callback, void *client_data) +#else +char *ExpandMacro(icmd, keyword, value, nkey, client_callback, client_data) + char *icmd; + char **keyword; + char **value; + int nkey; + MacroCall client_callback; + void *client_data; +#endif +{ + int i, j; + int maxlen; + char brace; + char *result; + char tbuf[1000]; + char tbuf1[1000]; + char *s; + char *ip; + char *mip; + + /* make a new string using the command as a base, but substituting + for "$" values as needed */ + result = (char *)malloc(BUFINC+1); + maxlen = BUFINC; + *result = '\0'; + for(i=0, ip=icmd; *ip; ip++){ + if( *ip != '$' ){ + AddChar(&result, &i, &maxlen, (int)*ip); + } + else{ + /* save beginning of macro */ + mip = ip; + /* skip past '$' */ + ip++; + /* check for brace mode */ + if( *ip == '{' ){ + brace = '{'; + ip++; + } + else if( *ip == '(' ){ + brace = '('; + ip++; + } + else + brace = '\0'; + /* get variable up to next non-alpha character or close brace */ + for(*tbuf='\0', j=0; *ip; ip++ ){ + /* if we are in brace mode, look for trailing brace */ + if( brace && *ip == (brace == '(' ? ')' : '}') ){ + ip++; + break; + } + /* else look for a non-alpha character */ + else if( !isalnum((int)*ip) && *ip != '_'){ + break; + } + else{ + tbuf[j++] = *ip; + tbuf[j] = '\0'; + } + } + /* back up so the outer loop adds this delimiting char to the output */ + ip--; + /* search for keyword from the list */ + if( (nkey > 0) && + (s=LookupKeywords(tbuf, keyword, value, nkey)) != NULL ){ + AddString(&result, &i, &maxlen, s); + } + /* execute the client routine to expand macros */ + else if( (client_callback != NULL) && + ((s=(*client_callback)(tbuf, client_data)) != NULL) ){ + AddString(&result, &i, &maxlen, s); + } + /* look for an environment variable */ + else if( (s = (char *)getenv(tbuf)) != NULL ){ + AddString(&result, &i, &maxlen, s); + } + /* if we don't recognize this macro, put it back onto the string */ + else{ + int len; + len = ip - mip + 1; + strncpy(tbuf1, mip, len); + tbuf1[len] = '\0'; + AddString(&result, &i, &maxlen, tbuf1); + } + } + } + /* null terminate and save the string */ + result[i] = '\0'; + result = (char *)realloc(result, i+1); + return(result); +} + |