54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/**
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* This file is part of the Fun programming language.
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* https://hanez.org/project/fun/
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*
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* Copyright 2025 Johannes Findeisen <you@hanez.org>
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* Licensed under the terms of the ISC license.
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* https://opensource.org/license/isc-license-txt
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*/
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/**
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* @file read_file.c
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* @brief Implements the OP_READ_FILE opcode for reading file contents in the VM.
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*
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* This file handles the OP_READ_FILE instruction, which reads the contents of a file
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* and pushes the result as a string onto the stack.
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*
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* Behavior:
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* - Pops the file path from the stack.
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* - Reads the file contents.
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* - Pushes the contents as a string onto the stack.
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*
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* Error Handling:
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* - Exits with an error if the file path is invalid or the file cannot be read.
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*
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* Example:
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* // Bytecode: OP_READ_FILE
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* // Stack before: ["file.txt"]
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* // Stack after: ["file contents"]
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*
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* @author Johannes Findeisen
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* @date 2025-10-16
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*/
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case OP_READ_FILE: {
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Value path = pop_value(vm);
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if (path.type != VAL_STRING) { fprintf(stderr, "READ_FILE expects string\n"); exit(1); }
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const char *p = path.s ? path.s : "";
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FILE *f = fopen(p, "rb");
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if (!f) { free_value(path); push_value(vm, make_string("")); break; }
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if (fseek(f, 0, SEEK_END) != 0) { fclose(f); free_value(path); push_value(vm, make_string("")); break; }
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long sz = ftell(f);
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if (sz < 0) { fclose(f); free_value(path); push_value(vm, make_string("")); break; }
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rewind(f);
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char *buf = (char*)malloc((size_t)sz + 1);
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size_t n = buf ? fread(buf, 1, (size_t)sz, f) : 0;
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fclose(f);
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if (!buf) { free_value(path); push_value(vm, make_string("")); break; }
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buf[n] = '\0';
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Value out = make_string(buf);
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free(buf);
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free_value(path);
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push_value(vm, out);
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break;
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}
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