/* flex - tool to generate fast lexical analyzers */ /* Copyright (c) 1990 The Regents of the University of California. */ /* All rights reserved. */ /* This code is derived from software contributed to Berkeley by */ /* Vern Paxson. */ /* The United States Government has rights in this work pursuant */ /* to contract no. DE-AC03-76SF00098 between the United States */ /* Department of Energy and the University of California. */ /* This file is part of flex. */ /* 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. */ /* 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR */ /* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */ /* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */ /* PURPOSE. */ #include "flexdef.h" /* Take note: The buffer object is sometimes used as a String buffer (one * continuous string), and sometimes used as a list of strings, usually line by * line. * * The type is specified in buf_init by the elt_size. If the elt_size is * sizeof(char), then the buffer should be treated as string buffer. If the * elt_size is sizeof(char*), then the buffer should be treated as a list of * strings. * * Certain functions are only appropriate for one type or the other. */ /* global buffers. */ struct Buf userdef_buf; /**< for user #definitions triggered by cmd-line. */ struct Buf defs_buf; /**< for #define's autogenerated. List of strings. */ struct Buf yydmap_buf; /**< string buffer to hold yydmap elements */ struct Buf m4defs_buf; /**< m4 definitions. List of strings. */ struct Buf top_buf; /**< contains %top code. String buffer. */ struct Buf *buf_print_strings(struct Buf * buf, FILE* out) { int i; if(!buf || !out) return buf; for (i=0; i < buf->nelts; i++){ const char * s = ((char**)buf->elts)[i]; if(s) fprintf(out, "%s", s); } return buf; } /* Append a "%s" formatted string to a string buffer */ struct Buf *buf_prints (struct Buf *buf, const char *fmt, const char *s) { char *t; size_t tsz; t = flex_alloc (tsz = strlen (fmt) + strlen (s) + 1); snprintf (t, tsz, fmt, s); buf = buf_strappend (buf, t); flex_free (t); return buf; } /** Append a line directive to the string buffer. * @param buf A string buffer. * @param filename file name * @param lineno line number * @return buf */ struct Buf *buf_linedir (struct Buf *buf, const char* filename, int lineno) { char *t, *fmt = "#line %d \"%s\"\n"; size_t tsz; t = flex_alloc (tsz = strlen (fmt) + strlen (filename) + (int)(1 + log10(lineno>=0?lineno:-lineno)) + 1); snprintf (t, tsz, fmt, lineno, filename); buf = buf_strappend (buf, t); flex_free (t); return buf; } /** Append the contents of @a src to @a dest. * @param @a dest the destination buffer * @param @a dest the source buffer * @return @a dest */ struct Buf *buf_concat(struct Buf* dest, const struct Buf* src) { buf_append(dest, src->elts, src->nelts); return dest; } /* Appends n characters in str to buf. */ struct Buf *buf_strnappend (buf, str, n) struct Buf *buf; const char *str; int n; { buf_append (buf, str, n + 1); /* "undo" the '\0' character that buf_append() already copied. */ buf->nelts--; return buf; } /* Appends characters in str to buf. */ struct Buf *buf_strappend (buf, str) struct Buf *buf; const char *str; { return buf_strnappend (buf, str, strlen (str)); } /* appends "#define str def\n" */ struct Buf *buf_strdefine (buf, str, def) struct Buf *buf; const char *str; const char *def; { buf_strappend (buf, "#define "); buf_strappend (buf, " "); buf_strappend (buf, str); buf_strappend (buf, " "); buf_strappend (buf, def); buf_strappend (buf, "\n"); return buf; } /** Pushes "m4_define( [[def]], [[val]])m4_dnl" to end of buffer. * @param buf A buffer as a list of strings. * @param def The m4 symbol to define. * @param val The definition; may be NULL. * @return buf */ struct Buf *buf_m4_define (struct Buf *buf, const char* def, const char* val) { const char * fmt = "m4_define( [[%s]], [[%s]])m4_dnl\n"; char * str; size_t strsz; val = val?val:""; str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + strlen(val) + 2); snprintf(str, strsz, fmt, def, val); buf_append(buf, &str, 1); return buf; } /** Pushes "m4_undefine([[def]])m4_dnl" to end of buffer. * @param buf A buffer as a list of strings. * @param def The m4 symbol to undefine. * @return buf */ struct Buf *buf_m4_undefine (struct Buf *buf, const char* def) { const char * fmt = "m4_undefine( [[%s]])m4_dnl\n"; char * str; size_t strsz; str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + 2); snprintf(str, strsz, fmt, def); buf_append(buf, &str, 1); return buf; } /* create buf with 0 elements, each of size elem_size. */ void buf_init (buf, elem_size) struct Buf *buf; size_t elem_size; { buf->elts = (void *) 0; buf->nelts = 0; buf->elt_size = elem_size; buf->nmax = 0; } /* frees memory */ void buf_destroy (buf) struct Buf *buf; { if (buf && buf->elts) flex_free (buf->elts); buf->elts = (void *) 0; } /* appends ptr[] to buf, grow if necessary. * n_elem is number of elements in ptr[], NOT bytes. * returns buf. * We grow by mod(512) boundaries. */ struct Buf *buf_append (buf, ptr, n_elem) struct Buf *buf; const void *ptr; int n_elem; { int n_alloc = 0; if (!ptr || n_elem == 0) return buf; /* May need to alloc more. */ if (n_elem + buf->nelts > buf->nmax) { /* exact amount needed... */ n_alloc = (n_elem + buf->nelts) * buf->elt_size; /* ...plus some extra */ if (((n_alloc * buf->elt_size) % 512) != 0 && buf->elt_size < 512) n_alloc += (512 - ((n_alloc * buf->elt_size) % 512)) / buf->elt_size; if (!buf->elts) buf->elts = allocate_array (n_alloc, buf->elt_size); else buf->elts = reallocate_array (buf->elts, n_alloc, buf->elt_size); buf->nmax = n_alloc; } memcpy ((char *) buf->elts + buf->nelts * buf->elt_size, ptr, n_elem * buf->elt_size); buf->nelts += n_elem; return buf; } /* vim:set tabstop=8 softtabstop=4 shiftwidth=4: */